What county am I in?

Press Find me and the map shows the county you are in. In the US it comes with its outline, FIPS code, population and the ZIP codes inside it; elsewhere, the county, district or municipality the geocoder knows.

How to use it

  1. Press Find me and allow the browser to use your location.
  2. Read the county in the first card. In the US the outline is drawn and the second card gives the FIPS code, the population and the ZIP codes.
  3. Type a place, click the map, or drag the pin to check another point.

5 practical uses

  1. Find the county for a permit, a court, a voter registration or a property record.
  2. Know which county emergency service or health department covers a place.
  3. Get the county FIPS code for a census dataset or a choropleth map.
  4. Check whether a rural address is inside a county with a burn ban or a curfew.
  5. See the ZIP codes a county holds for a mailing or a sales territory.

The maths behind it

The point is tested against the 3,200 county outlines with a point-in-polygon test after a bounding-box check. The county population is the sum of the 2020 populations of the ZIP codes assigned to it, weighted by the share of each ZIP code that lies in the county.

How accurate it is

A phone with GPS is accurate to a few metres outdoors; a laptop on Wi-Fi is often within a hundred metres, and a wired desktop may be placed at the nearest exchange, a town away. Near a boundary, drag the pin to check. US county outlines come from the Census Bureau (1:10m), so the county is found in the browser even before the geocoder answers. The county populations are sums of ZIP code populations and so approximate.

Privacy

The page never stores your position. The link in the address bar carries the coordinates so you can share or bookmark the result; clear it if you would rather not.

More tools

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Questions and answers

How is the county found?

In the US the point is tested against the Census Bureau county outlines in your browser, so it is found even before the geocoder answers. Elsewhere the geocoder names the county, district or municipality.

Why is the population marked approximate?

It is the sum of the 2020 ZIP code populations assigned to the county. ZIP codes cross county lines, so the sum is close to the census figure but not equal to it.

What about parishes, boroughs and independent cities?

They are county equivalents and appear the same way: Louisiana parishes, Alaska boroughs and census areas, and the independent cities of Virginia each have a FIPS code and an outline.

Embed this tool on your website

Paste this code where the tool should appear. It shows the tool alone, without this page's text, and links back here. It is free to use; the map data credit stays on the map.

<iframe src="https://waymorphic.com/tools/what-county-am-i-in?embed=1" width="100%" height="760" style="border:0;border-radius:12px;max-width:100%" loading="lazy" allow="geolocation; fullscreen; clipboard-write" title="What county am I in? – Waymorphic Map"></iframe>

Change height to suit your page. To open the tool with a place already set, add the settings from this page's address bar (the part after #) to the end of the src. The embedded tool asks the visitor's browser for their location only when they press the button, and the allow attribute lets that work inside the frame.