County Maps US

US counties starting with M

294 counties and county-equivalents, which is 9% of the 3,144 in the United States. They are spread across 44 states. Sort any column, or select a county for its map and full data.

Every county beginning with M

US counties and county-equivalents starting with M
NameStatePopulationLand areaDensityMedian incomeSeatFIPS
Mackinac CountyMichigan11,2361,022 sq mi11.0 per sq mi$63,909St. Ignace26097
Macomb CountyMichigan886,221479.4 sq mi1,849 per sq mi$77,837Mount Clemens26099
Macon CountyAlabama18,132608.7 sq mi29.8 per sq mi$43,707Tuskegee01087
Macon CountyGeorgia11,756400.7 sq mi29.3 per sq mi$41,031Oglethorpe13193
Macon CountyIllinois99,300580.5 sq mi171 per sq mi$62,666Decatur17115
Macon CountyMissouri15,190801.2 sq mi19.0 per sq mi$62,357Macon29121
Macon CountyNorth Carolina39,232515.5 sq mi76.1 per sq mi$59,061Franklin37113
Macon CountyTennessee27,663307.1 sq mi90.1 per sq mi$59,177Lafayette47111
Macoupin CountyIllinois43,748863 sq mi50.7 per sq mi$70,805Carlinville17117
Madera CountyCalifornia167,9272,137 sq mi78.6 per sq mi$76,627Madera06039
Madison CountyAlabama433,516801.6 sq mi541 per sq mi$86,499Huntsville01089
Madison CountyArkansas18,410834.2 sq mi22.1 per sq mi$56,798Huntsville05087
Madison CountyFlorida18,759696.5 sq mi26.9 per sq mi$48,485Madison12079
Madison CountyGeorgia32,919282.3 sq mi117 per sq mi$61,963Danielsville13195
Madison CountyIdaho55,172469.3 sq mi118 per sq mi$60,160Rexburg16065
Madison CountyIllinois263,110715.5 sq mi368 per sq mi$75,793Edwardsville17119
Madison CountyIndiana135,088451.9 sq mi299 per sq mi$63,037Anderson18095
Madison CountyIowa17,270561 sq mi30.8 per sq mi$90,855Winterset19121
Madison CountyKentucky101,696437.9 sq mi232 per sq mi$63,351Richmond21151
Madison ParishLouisiana8,844623.9 sq mi14.2 per sq mi$35,456Tallulah22065
Madison CountyMississippi116,298714.2 sq mi163 per sq mi$83,441Canton28089
Madison CountyMissouri12,858494.4 sq mi26.0 per sq mi$54,434Fredericktown29123
Madison CountyMontana10,0263,588 sq mi2.8 per sq mi$75,250Virginia City30057
Madison CountyNebraska36,106572.6 sq mi63.1 per sq mi$63,128Madison31119
Madison CountyNew York67,120654.9 sq mi102 per sq mi$75,499Wampsville36053
Madison CountyNorth Carolina22,553449.6 sq mi50.2 per sq mi$58,531Marshall37115
Madison CountyOhio46,985466.7 sq mi101 per sq mi$87,045London39097
Madison CountyTennessee100,790557.2 sq mi181 per sq mi$60,042Jackson47113
Madison CountyTexas14,226466.1 sq mi30.5 per sq mi$74,596Madisonville48313
Madison CountyVirginia14,237320.6 sq mi44.4 per sq mi$84,323Madison51113
Magoffin CountyKentucky11,110308.4 sq mi36.0 per sq mi$33,080Salyersville21153
Mahaska CountyIowa21,880570.9 sq mi38.3 per sq mi$70,940Oskaloosa19123
Mahnomen CountyMinnesota5,153557.9 sq mi9.2 per sq mi$59,441Mahnomen27087
Mahoning CountyOhio224,706411.5 sq mi546 per sq mi$56,942Youngstown39099
Major CountyOklahoma7,536955 sq mi7.9 per sq mi$71,266Fairview40093
Malheur CountyOregon32,2619,888 sq mi3.3 per sq mi$54,519Vale41045
Manassas cityVirginia44,3329.8 sq mi4,504 per sq mi$113,590Manassas city51683
Manassas Park cityVirginia16,5603.0 sq mi5,474 per sq mi$103,250Manassas Park city51685
Manatee CountyFlorida468,200742.8 sq mi630 per sq mi$78,457Bradenton12081
Manistee CountyMichigan25,656542.3 sq mi47.3 per sq mi$63,516Manistee26101
Manitowoc CountyWisconsin81,710589.3 sq mi139 per sq mi$69,148Manitowoc55071
Marathon CountyWisconsin139,4321,545 sq mi90.2 per sq mi$77,884Wausau55073
Marengo CountyAlabama18,311976.9 sq mi18.7 per sq mi$43,825Linden01091
Maricopa CountyArizona4,689,5589,202 sq mi510 per sq mi$89,300Phoenix04013
Maries CountyMissouri8,397527 sq mi15.9 per sq mi$59,455Vienna29125
Marin CountyCalifornia253,694520.1 sq mi488 per sq mi$149,091San Rafael06041
Marinette CountyWisconsin42,5741,399 sq mi30.4 per sq mi$63,809Marinette55075
Marion CountyAlabama29,097742.3 sq mi39.2 per sq mi$50,088Hamilton01093
Marion CountyArkansas17,593596.6 sq mi29.5 per sq mi$48,619Yellville05089
Marion CountyFlorida442,6601,588 sq mi279 per sq mi$61,010Ocala12083
Marion CountyGeorgia7,676365.7 sq mi21.0 per sq mi$51,667Buena Vista13197
Marion CountyIllinois36,382572.5 sq mi63.5 per sq mi$61,240Salem17121
Marion CountyIndiana992,196396 sq mi2,506 per sq mi$66,346Indianapolis18097
Marion CountyIowa34,192554.5 sq mi61.7 per sq mi$78,680Knoxville19125
Marion CountyKansas11,634944.3 sq mi12.3 per sq mi$64,695Marion20115
Marion CountyKentucky20,115343.6 sq mi58.6 per sq mi$59,627Lebanon21155
Marion CountyMississippi24,001542.3 sq mi44.3 per sq mi$45,110Columbia28091
Marion CountyMissouri28,525436.9 sq mi65.3 per sq mi$62,903Palmyra29127
Marion CountyOhio65,115403.8 sq mi161 per sq mi$59,371Marion39101
Marion CountyOregon355,7771,181 sq mi301 per sq mi$77,351Salem41047
Marion CountySouth Carolina28,242489.4 sq mi57.7 per sq mi$36,301Marion45067
Marion CountyTennessee29,804498.3 sq mi59.8 per sq mi$61,824Jasper47115
Marion CountyTexas9,896380.9 sq mi26.0 per sq mi$49,672Jefferson48315
Marion CountyWest Virginia55,584308.8 sq mi180 per sq mi$67,370Fairmont54049
Mariposa CountyCalifornia16,9181,449 sq mi11.7 per sq mi$68,412Mariposa06043
Marlboro CountySouth Carolina25,488479.9 sq mi53.1 per sq mi$34,301Bennettsville45069
Marquette CountyMichigan68,0641,809 sq mi37.6 per sq mi$65,429Marquette26103
Marquette CountyWisconsin15,927455.7 sq mi35.0 per sq mi$65,681Montello55077
Marshall CountyAlabama103,537565.9 sq mi183 per sq mi$62,571Guntersville01095
Marshall CountyIllinois11,473386.8 sq mi29.7 per sq mi$71,585Lacon17123
Marshall CountyIndiana46,599443.6 sq mi105 per sq mi$71,808Plymouth18099
Marshall CountyIowa39,890572.5 sq mi69.7 per sq mi$73,315Marshalltown19127
Marshall CountyKansas9,852900.2 sq mi10.9 per sq mi$68,419Marysville20117
Marshall CountyKentucky31,659302.1 sq mi105 per sq mi$65,831Benton21157
Marshall CountyMinnesota8,7981,775 sq mi5.0 per sq mi$72,543Warren27089
Marshall CountyMississippi34,654706.2 sq mi49.1 per sq mi$53,458Holly Springs28093
Marshall CountyOklahoma16,255371.5 sq mi43.8 per sq mi$57,245Madill40095
Marshall CountySouth Dakota4,426838.1 sq mi5.3 per sq mi$78,156Britton46091
Marshall CountyTennessee38,071375.5 sq mi101 per sq mi$71,049Lewisburg47117
Marshall CountyWest Virginia29,159305.4 sq mi95.5 per sq mi$59,169Moundsville54051
Martin CountyFlorida166,272543.9 sq mi306 per sq mi$82,943Stuart12085
Martin CountyIndiana9,856335.8 sq mi29.4 per sq mi$68,594Shoals18101
Martin CountyKentucky10,697229.6 sq mi46.6 per sq mi$37,042Inez21159
Martin CountyMinnesota19,440712.3 sq mi27.3 per sq mi$59,507Fairmont27091
Martin CountyNorth Carolina21,601456.4 sq mi47.3 per sq mi$48,578Williamston37117
Martin CountyTexas5,284915 sq mi5.8 per sq mi$93,734Stanton48317
Martinsville cityVirginia13,84911.0 sq mi1,264 per sq mi$46,727Martinsville city51690
Mason CountyIllinois12,411539.4 sq mi23.0 per sq mi$62,845Havana17125
Mason CountyKentucky16,936240.1 sq mi70.5 per sq mi$52,178Maysville21161
Mason CountyMichigan29,040495 sq mi58.7 per sq mi$64,748Ludington26105
Mason CountyTexas3,990928.8 sq mi4.3 per sq mi$74,180Mason48319
Mason CountyWashington71,165959.6 sq mi74.2 per sq mi$83,270Shelton53045
Mason CountyWest Virginia24,707430.8 sq mi57.4 per sq mi$49,761Point Pleasant54053
Massac CountyIllinois13,502237.2 sq mi56.9 per sq mi$65,116Metropolis17127
Matagorda CountyTexas36,4631,093 sq mi33.4 per sq mi$58,628Bay City48321
Matanuska-Susitna BoroughAlaska118,66624,707 sq mi4.8 per sq mi$94,031Palmer02170
Mathews CountyVirginia8,52985.9 sq mi99.3 per sq mi$75,880Mathews51115
Maui CountyHawaii160,5921,162 sq mi138 per sq mi$97,161Wailuku15009
Maury CountyTennessee118,131613.1 sq mi193 per sq mi$76,130Columbia47119
Maverick CountyTexas58,8231,279 sq mi46.0 per sq mi$49,568Eagle Pass48323
Mayes CountyOklahoma40,416655.3 sq mi61.7 per sq mi$60,305Pryor Creek40097
McClain CountyOklahoma49,647570.7 sq mi87.0 per sq mi$84,552Purcell40087
McCone CountyMontana1,7202,642 sq mi0.65 per sq mi$69,375Circle30055
McCook CountySouth Dakota5,964574.2 sq mi10.4 per sq mi$83,852Salem46087
McCormick CountySouth Carolina10,215358.9 sq mi28.5 per sq mi$55,798McCormick45065
McCracken CountyKentucky67,553248.8 sq mi272 per sq mi$64,373Paducah21145
McCreary CountyKentucky17,124426.7 sq mi40.1 per sq mi$33,750Whitley City21147
McCulloch CountyTexas7,4721,066 sq mi7.0 per sq mi$54,043Brady48307
McCurtain CountyOklahoma30,7441,851 sq mi16.6 per sq mi$51,929Idabel40089
McDonald CountyMissouri23,992539.4 sq mi44.5 per sq mi$52,375Pineville29119
McDonough CountyIllinois25,916589.3 sq mi44.0 per sq mi$52,795Macomb17109
McDowell CountyNorth Carolina45,198440 sq mi103 per sq mi$57,168Marion37111
McDowell CountyWest Virginia16,878533.5 sq mi31.6 per sq mi$31,559Welch54047
McDuffie CountyGeorgia21,640257.4 sq mi84.1 per sq mi$56,733Thomson13189
McHenry CountyIllinois317,751603.4 sq mi527 per sq mi$104,802Woodstock17111
McHenry CountyNorth Dakota5,1301,874 sq mi2.7 per sq mi$80,733Towner38049
McIntosh CountyGeorgia11,989431.3 sq mi27.8 per sq mi$50,273Darien13191
McIntosh CountyNorth Dakota2,451974.6 sq mi2.5 per sq mi$64,419Ashley38051
McIntosh CountyOklahoma19,758618.3 sq mi32.0 per sq mi$46,281Eufaula40091
McKean CountyPennsylvania38,984979.7 sq mi39.8 per sq mi$62,905Smethport42083
McKenzie CountyNorth Dakota15,1922,760 sq mi5.5 per sq mi$93,404Watford City38053
McKinley CountyNew Mexico68,1195,451 sq mi12.5 per sq mi$47,668Gallup35031
McLean CountyIllinois171,4191,183 sq mi145 per sq mi$79,905Bloomington17113
McLean CountyKentucky9,064252.5 sq mi35.9 per sq mi$65,596Calhoun21149
McLean CountyNorth Dakota9,7402,110 sq mi4.6 per sq mi$83,583Washburn38055
McLennan CountyTexas272,0201,037 sq mi262 per sq mi$66,643Waco48309
McLeod CountyMinnesota36,631491.5 sq mi74.5 per sq mi$80,084Glencoe27085
McMinn CountyTennessee57,404430.1 sq mi133 per sq mi$61,470Athens47107
McMullen CountyTexas5441,140 sq mi0.48 per sq mi$43,875Tilden48311
McNairy CountyTennessee26,236562.8 sq mi46.6 per sq mi$53,473Selmer47109
McPherson CountyKansas30,064898.3 sq mi33.5 per sq mi$78,851McPherson20113
McPherson CountyNebraska369859.3 sq mi0.43 per sq mi$58,684Tryon31117
McPherson CountySouth Dakota2,3471,137 sq mi2.1 per sq mi$66,906Leola46089
Meade CountyKansas3,852978.1 sq mi3.9 per sq mi$71,852Meade20119
Meade CountyKentucky30,699305.5 sq mi100 per sq mi$74,355Brandenburg21163
Meade CountySouth Dakota30,7113,471 sq mi8.9 per sq mi$74,790Sturgis46093
Meagher CountyMontana2,1372,392 sq mi0.89 per sq mi$71,932White Sulphur Springs30059
Mecklenburg CountyNorth Carolina1,233,383523.6 sq mi2,356 per sq mi$87,005Charlotte37119
Mecklenburg CountyVirginia30,747625.3 sq mi49.2 per sq mi$57,045Boydton51117
Mecosta CountyMichigan42,320555.2 sq mi76.2 per sq mi$60,951Big Rapids26107
Medina CountyOhio185,025421.5 sq mi439 per sq mi$94,968Medina39103
Medina CountyTexas56,8811,325 sq mi42.9 per sq mi$78,074Hondo48325
Meeker CountyMinnesota23,603608 sq mi38.8 per sq mi$75,446Litchfield27093
Meigs CountyOhio21,587430.1 sq mi50.2 per sq mi$46,873Pomeroy39105
Meigs CountyTennessee14,186195.1 sq mi72.7 per sq mi$61,375Decatur47121
Mellette CountySouth Dakota2,1371,307 sq mi1.6 per sq mi$54,076White River46095
Menard CountyIllinois11,863314.4 sq mi37.7 per sq mi$82,176Petersburg17129
Menard CountyTexas1,956902 sq mi2.2 per sq mi$53,043Menard48327
Mendocino CountyCalifornia88,1223,507 sq mi25.1 per sq mi$68,092Ukiah06045
Menifee CountyKentucky6,430203.5 sq mi31.6 per sq mi$45,096Frenchburg21165
Menominee CountyMichigan22,9411,044 sq mi22.0 per sq mi$56,435Menominee26109
Menominee CountyWisconsin4,199357.6 sq mi11.7 per sq mi$62,108Keshena55078
Merced CountyCalifornia297,2601,938 sq mi153 per sq mi$65,510Merced06047
Mercer CountyIllinois15,229561.2 sq mi27.1 per sq mi$74,182Aledo17131
Mercer CountyKentucky23,733249.4 sq mi95.2 per sq mi$64,824Harrodsburg21167
Mercer CountyMissouri3,404453.8 sq mi7.5 per sq mi$62,679Princeton29129
Mercer CountyNew Jersey399,289224.5 sq mi1,779 per sq mi$100,645Trenton34021
Mercer CountyNorth Dakota8,4411,043 sq mi8.1 per sq mi$80,946Stanton38057
Mercer CountyOhio42,737462.4 sq mi92.4 per sq mi$76,782Celina39107
Mercer CountyPennsylvania107,860672.5 sq mi160 per sq mi$59,976Mercer42085
Mercer CountyWest Virginia57,503419 sq mi137 per sq mi$53,210Princeton54055
Meriwether CountyGeorgia21,516500.9 sq mi43.0 per sq mi$57,340Greenville13199
Merrick CountyNebraska7,905487.8 sq mi16.2 per sq mi$68,354Central City31121
Merrimack CountyNew Hampshire158,078932.9 sq mi169 per sq mi$97,004Concord33013
Mesa CountyColorado162,8453,329 sq mi48.9 per sq mi$73,658Grand Junction08077
Metcalfe CountyKentucky10,583289.7 sq mi36.5 per sq mi$51,473Edmonton21169
Miami CountyIndiana34,487373.8 sq mi92.3 per sq mi$61,139Peru18103
Miami CountyKansas36,240575.9 sq mi62.9 per sq mi$89,000Paola20121
Miami CountyOhio112,634406.6 sq mi277 per sq mi$76,817Troy39109
Miami-Dade CountyFlorida2,802,0291,900 sq mi1,475 per sq mi$71,753Miami12086
Middlesex CountyMassachusetts1,669,979817.9 sq mi2,042 per sq mi$130,847Cambridge25017
Middlesex CountyNew Jersey883,335309.3 sq mi2,856 per sq mi$111,549New Brunswick34023
Middlesex CountyVirginia10,841130.3 sq mi83.2 per sq mi$75,060Saluda51119
Midland CountyMichigan83,754518.4 sq mi162 per sq mi$77,705Midland26111
Midland CountyTexas187,855900.4 sq mi209 per sq mi$92,874Midland48329
Mifflin CountyPennsylvania46,127411 sq mi112 per sq mi$63,953Lewistown42087
Milam CountyTexas26,2581,016 sq mi25.8 per sq mi$66,141Cameron48331
Millard CountyUtah14,0576,785 sq mi2.1 per sq mi$73,639Fillmore49027
Mille Lacs CountyMinnesota27,753572.3 sq mi48.5 per sq mi$72,729Milaca27095
Miller CountyArkansas42,357624 sq mi67.9 per sq mi$48,836Texarkana05091
Miller CountyGeorgia5,812282.4 sq mi20.6 per sq mi$51,425Colquitt13201
Miller CountyMissouri25,817592.6 sq mi43.6 per sq mi$56,736Tuscumbia29131
Mills CountyIowa14,793437.4 sq mi33.8 per sq mi$90,753Glenwood19129
Mills CountyTexas4,580748.2 sq mi6.1 per sq mi$67,620Goldthwaite48333
Milwaukee CountyWisconsin924,216241.5 sq mi3,828 per sq mi$64,435Milwaukee55079
Miner CountySouth Dakota2,281570.2 sq mi4.0 per sq mi$76,140Howard46097
Mineral CountyColorado910875.8 sq mi1.0 per sq mi$56,250Creede08079
Mineral CountyMontana5,1851,220 sq mi4.3 per sq mi$63,450Superior30061
Mineral CountyNevada4,4073,751 sq mi1.2 per sq mi$54,855Hawthorne32021
Mineral CountyWest Virginia26,792327.9 sq mi81.7 per sq mi$69,375Keyser54057
Mingo CountyWest Virginia21,455423.1 sq mi50.7 per sq mi$38,119Williamson54059
Minidoka CountyIdaho22,911757.2 sq mi30.3 per sq mi$70,377Rupert16067
Minnehaha CountySouth Dakota212,691806.9 sq mi264 per sq mi$76,880Sioux Falls46099
Missaukee CountyMichigan15,274564.8 sq mi27.0 per sq mi$66,194Lake City26113
Mississippi CountyArkansas37,828902.1 sq mi41.9 per sq mi$52,548Blytheville05093
Mississippi CountyMissouri12,003411.6 sq mi29.2 per sq mi$48,160Charleston29133
Missoula CountyMontana123,5132,593 sq mi47.6 per sq mi$75,598Missoula30063
Mitchell CountyGeorgia20,467512.2 sq mi40.0 per sq mi$57,613Camilla13205
Mitchell CountyIowa10,650469.3 sq mi22.7 per sq mi$71,365Osage19131
Mitchell CountyKansas5,590701.8 sq mi8.0 per sq mi$64,246Beloit20123
Mitchell CountyNorth Carolina15,062221.3 sq mi68.1 per sq mi$57,602Bakersville37121
Mitchell CountyTexas8,947911.1 sq mi9.8 per sq mi$60,550Colorado City48335
Mobile CountyAlabama411,6581,229 sq mi335 per sq mi$58,880Mobile01097
Modoc CountyCalifornia8,4263,948 sq mi2.1 per sq mi$59,455Alturas06049
Moffat CountyColorado13,1224,743 sq mi2.8 per sq mi$73,849Craig08081
Mohave CountyArizona228,10213,332 sq mi17.1 per sq mi$57,684Kingman04015
Moniteau CountyMissouri15,428415 sq mi37.2 per sq mi$65,715California29135
Monmouth CountyNew Jersey651,035468.2 sq mi1,390 per sq mi$124,845Freehold34025
Mono CountyCalifornia12,5053,049 sq mi4.1 per sq mi$99,415Bridgeport06051
Monona CountyIowa8,539694.1 sq mi12.3 per sq mi$68,377Onawa19133
Monongalia CountyWest Virginia107,991360.1 sq mi300 per sq mi$65,346Morgantown54061
Monroe CountyAlabama18,9651,026 sq mi18.5 per sq mi$42,292Monroeville01099
Monroe CountyArkansas6,244607.5 sq mi10.3 per sq mi$43,214Clarendon05095
Monroe CountyFlorida80,406983 sq mi81.8 per sq mi$87,738Key West12087
Monroe CountyGeorgia32,023396.1 sq mi80.8 per sq mi$83,183Forsyth13207
Monroe CountyIllinois34,840385.3 sq mi90.4 per sq mi$102,880Waterloo17133
Monroe CountyIndiana143,345394.5 sq mi363 per sq mi$65,868Bloomington18105
Monroe CountyIowa7,406433.7 sq mi17.1 per sq mi$70,996Albia19135
Monroe CountyKentucky11,191329.5 sq mi34.0 per sq mi$51,280Tompkinsville21171
Monroe CountyMichigan156,004549.4 sq mi284 per sq mi$77,335Monroe26115
Monroe CountyMississippi33,318765.1 sq mi43.5 per sq mi$51,866Aberdeen28095
Monroe CountyMissouri8,959647.6 sq mi13.8 per sq mi$54,516Paris29137
Monroe CountyNew York750,506657 sq mi1,142 per sq mi$76,382Rochester36055
Monroe CountyOhio12,994455.6 sq mi28.5 per sq mi$60,134Woodsfield39111
Monroe CountyPennsylvania167,179608.4 sq mi275 per sq mi$83,565Stroudsburg42089
Monroe CountyTennessee49,730635.8 sq mi78.2 per sq mi$56,895Madisonville47123
Monroe CountyWest Virginia12,491472.8 sq mi26.4 per sq mi$56,750Union54063
Monroe CountyWisconsin46,572900.9 sq mi51.7 per sq mi$69,467Sparta55081
Montague CountyTexas21,966930.9 sq mi23.6 per sq mi$64,545Montague48337
Montcalm CountyMichigan69,406705.3 sq mi98.4 per sq mi$67,344Stanton26117
Monterey CountyCalifornia433,7293,282 sq mi132 per sq mi$97,230Salinas06053
Montezuma CountyColorado26,6782,029 sq mi13.1 per sq mi$65,244Cortez08083
Montgomery CountyAlabama225,891785.4 sq mi288 per sq mi$59,386Montgomery01101
Montgomery CountyArkansas8,579780.5 sq mi11.0 per sq mi$48,906Mount Ida05097
Montgomery CountyGeorgia8,635241.1 sq mi35.8 per sq mi$51,941Mount Vernon13209
Montgomery CountyIllinois28,076703.8 sq mi39.9 per sq mi$63,620Hillsboro17135
Montgomery CountyIndiana38,954504.6 sq mi77.2 per sq mi$71,479Crawfordsville18107
Montgomery CountyIowa10,002424.1 sq mi23.6 per sq mi$63,666Red Oak19137
Montgomery CountyKansas30,177643.6 sq mi46.9 per sq mi$55,697Independence20125
Montgomery CountyKentucky28,822197.4 sq mi146 per sq mi$56,396Mount Sterling21173
Montgomery CountyMaryland1,074,582493.1 sq mi2,179 per sq mi$132,450Rockville24031
Montgomery CountyMississippi9,354407 sq mi23.0 per sq mi$41,748Winona28097
Montgomery CountyMissouri11,590535 sq mi21.7 per sq mi$65,500Montgomery City29139
Montgomery CountyNew York50,046403.1 sq mi124 per sq mi$64,943Fonda36057
Montgomery CountyNorth Carolina26,403491.5 sq mi53.7 per sq mi$57,766Troy37123
Montgomery CountyOhio539,598461.4 sq mi1,170 per sq mi$66,139Dayton39113
Montgomery CountyPennsylvania877,643482.9 sq mi1,817 per sq mi$113,915Norristown42091
Montgomery CountyTennessee249,935539.2 sq mi464 per sq mi$75,613Clarksville47125
Montgomery CountyTexas781,1941,042 sq mi750 per sq mi$97,701Conroe48339
Montgomery CountyVirginia98,434386.8 sq mi254 per sq mi$72,715Christiansburg51121
Montmorency CountyMichigan9,842546.7 sq mi18.0 per sq mi$49,756Atlanta26119
Montour CountyPennsylvania17,868130.3 sq mi137 per sq mi$76,976Danville42093
Montrose CountyColorado44,5912,241 sq mi19.9 per sq mi$72,120Montrose08085
Moody CountySouth Dakota6,632519.4 sq mi12.8 per sq mi$78,427Flandreau46101
Moore CountyNorth Carolina110,619697.6 sq mi159 per sq mi$86,080Carthage37125
Moore CountyTennessee6,920129.2 sq mi53.6 per sq mi$66,469Lynchburg47127
Moore CountyTexas21,891899.7 sq mi24.3 per sq mi$61,762Dumas48341
Mora CountyNew Mexico4,0511,926 sq mi2.1 per sq mi$53,663Mora35033
Morehouse ParishLouisiana23,705795 sq mi29.8 per sq mi$39,454Bastrop22067
Morgan CountyAlabama126,483579.7 sq mi218 per sq mi$68,845Decatur01103
Morgan CountyColorado30,3061,280 sq mi23.7 per sq mi$73,278Fort Morgan08087
Morgan CountyGeorgia22,095347.4 sq mi63.6 per sq mi$78,111Madison13211
Morgan CountyIllinois32,515569 sq mi57.1 per sq mi$66,306Jacksonville17137
Morgan CountyIndiana74,967403.8 sq mi186 per sq mi$79,429Martinsville18109
Morgan CountyKentucky14,415381.1 sq mi37.8 per sq mi$47,913West Liberty21175
Morgan CountyMissouri22,418597.6 sq mi37.5 per sq mi$53,412Versailles29141
Morgan CountyOhio13,626416.4 sq mi32.7 per sq mi$59,351McConnelsville39115
Morgan CountyTennessee22,160522.2 sq mi42.4 per sq mi$65,954Wartburg47129
Morgan CountyUtah13,383609.2 sq mi22.0 per sq mi$130,929Morgan49029
Morgan CountyWest Virginia18,027229.1 sq mi78.7 per sq mi$72,179Berkeley Springs54065
Morrill CountyNebraska4,4041,424 sq mi3.1 per sq mi$58,500Bridgeport31123
Morris CountyKansas5,348695.3 sq mi7.7 per sq mi$58,686Council Grove20127
Morris CountyNew Jersey524,251461 sq mi1,137 per sq mi$137,326Morristown34027
Morris CountyTexas12,133252 sq mi48.1 per sq mi$58,645Daingerfield48343
Morrison CountyMinnesota34,6201,125 sq mi30.8 per sq mi$69,446Little Falls27097
Morrow CountyOhio36,305406.1 sq mi89.4 per sq mi$75,283Mount Gilead39117
Morrow CountyOregon12,6022,031 sq mi6.2 per sq mi$75,448Heppner41049
Morton CountyKansas2,470729.7 sq mi3.4 per sq mi$66,447Elkhart20129
Morton CountyNorth Dakota34,6011,926 sq mi18.0 per sq mi$79,382Mandan38059
Motley CountyTexas1,043989.6 sq mi1.1 per sq mi$61,154Matador48345
Moultrie CountyIllinois14,371336 sq mi42.8 per sq mi$71,784Sullivan17139
Mountrail CountyNorth Dakota9,3951,825 sq mi5.2 per sq mi$80,717Stanley38061
Mower CountyMinnesota40,971711.3 sq mi57.6 per sq mi$73,074Austin27099
Muhlenberg CountyKentucky30,634467.3 sq mi65.6 per sq mi$51,927Greenville21177
Multnomah CountyOregon795,391431 sq mi1,845 per sq mi$88,766Portland41051
Murray CountyGeorgia41,607344.5 sq mi121 per sq mi$69,253Chatsworth13213
Murray CountyMinnesota7,942704.7 sq mi11.3 per sq mi$74,033Slayton27101
Murray CountyOklahoma13,805416.4 sq mi33.2 per sq mi$66,322Sulphur40099
Muscatine CountyIowa41,853437.4 sq mi95.7 per sq mi$69,396Muscatine19139
Muscogee CountyGeorgia202,171216.5 sq mi934 per sq mi$58,073Columbus13215
Muskegon CountyMichigan177,901503.9 sq mi353 per sq mi$65,024Muskegon26121
Muskingum CountyOhio87,014664.5 sq mi131 per sq mi$60,780Zanesville39119
Muskogee CountyOklahoma66,708810.6 sq mi82.3 per sq mi$53,619Muskogee40101
Musselshell CountyMontana5,5821,869 sq mi3.0 per sq mi$58,920Roundup30065

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Retrieved 30 August 2026.