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This code is called the "fips" or "county fips" code. It is a unique identifier for that particular county in the state you look at. Here is a good intro:

A full county code looks like 23025 where the first two characters are the state fips code and the last three are the county fips code. Depending on the data set you are looking at you can also view the areatype code (for things like Metro Area, County, State, US Region, etc).

Full list of county fips codes can be found here:


Map documentation can be found at...

Map data can be found at...

If you scroll down to "USA States" > "Maryland, admin2" > "GeoJSON" link, you can open/download the map data for Maryland. Search the JSON data for "us-md-025". You will find "name":"Harford".

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