County Maps US

How US counties work

The United States has 3,144 county-equivalents across nine legal types, 35 of which have no county government. Almost every general reference gets some part of that wrong. These pieces explain the parts that are actually confusing, from primary sources.

  1. What is a county, and what does it actually do?The unit almost every American lives in, what it is responsible for, and why nine different legal types all count as one.
  2. How many counties are there in the United States?You will see 3,142, 3,143 and 3,144 quoted as the answer. All three are defensible, and the difference is mostly Connecticut.
  3. Why does Louisiana have parishes instead of counties?A Spanish colonial church boundary, kept by the French, and written into law by the first territorial legislature in 1807.
  4. Why does Alaska have boroughs and census areas instead of counties?Alaska has no counties at all. It has 19 organised boroughs, and everything else is one enormous Unorganized Borough that the Census Bureau subdivides on paper.
  5. Why did Connecticut replace its counties with planning regions?Connecticut abolished county government in 1960 and kept the empty shells for 62 years. In 2022 the Census Bureau finally replaced them.
  6. What is an independent city, and why does Virginia have 38 of them?Cities that sit inside no county at all. Virginia has 38, three other states have one each, and it is the single most common cause of a broken county dataset.
  7. Why does Texas have 254 counties?More than any other state, by a margin of 95. The usual explanation involves a horse, and it is only partly true.
  8. How were US county boundaries drawn?Rivers in the east, survey lines in the west, and a visible seam running roughly down the middle of the country.
  9. What is a county seat, and why do 21 places have none?The town where the courthouse is. Except where the county is its own seat, where the courthouse is in another county, and where there is no county government to seat.
  10. The 35 US counties that have no county governmentConnecticut, Rhode Island, most of Massachusetts, all of Alaska’s census areas, and one county in Hawaii whose mayor is a state health official.
  11. What is a county FIPS code, and why does it sometimes change?Five digits that identify every US county. They are assigned alphabetically, which is exactly why a rename can force a new one.
  12. Why three Census figures for the same county disagreeThe decennial count, the annual estimates and the American Community Survey are three different products measuring three different things.
  13. Which is the largest US county, and which is the smallest?Four different right answers, depending on whether you mean area or population and whether Alaska counts.
  14. How these county maps are madeWhich Census file the boundaries come from, how much they are simplified, and why our maps differ slightly from everyone else’s.

What is not here

There is no standalone page defining a county seat, or explaining the difference between a county and a city. Those are dictionary questions, they are answered directly in search results, and a page competing for them would add nothing. The definitions live in the glossary instead, where they are useful as reference rather than pretending to be articles.