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I'm currently designing a map for methamphetamine labs in my state. Ideally what I need is the center lat/lon coordinates for each county in my state or the lat/lon coordinates for each county seat. If anybody knows where I could find such a dataset, I would appreciate it as it would certainly save me a lot of time and data entry. If not I'll be going through all of the counties in wikipedia, finding the county seat and getting each set of coordinates manually. I apologize in advance in case the question isn't appropriate for this stackexchange.

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What state is it you're after? –  Jersey Andy Jun 24 at 20:01
    
I'm looking for coordinates for counties in the state of Indiana. –  Caimen Jun 24 at 20:08
    
You may want to also ask this on the Open Data (beta) Stack Exchange. Normally cross-posting is frowned upon but with no guarantee that a Beta will graduate to become a full SE site, I think it is OK to do in this instance. meta.stackexchange.com/questions/234495/… –  PolyGeo Jun 24 at 21:15

2 Answers 2

up vote 1 down vote accepted

There are a couple of ways to get the data you want. Since your question is asking specifically for coordinates and not actual GIS data (ie a shapefile), this question may be off topic / more appropriate at the Open Data StackExchange.

My first suggestion is the second link at http://www.stats.indiana.edu/maptools/ which will give you a coordinate list of all Indiana place names in an Excel spreadsheet. You will then need to filter the list to match a county seat list.

If you wanted GIS data, you could visit the Census website, Geospatial Data Gateway, or any number of other sites to download a point shapefile of all cities in Indiana, and again filter it to county seats. Some of those datasets may actually have that information as an attribute you can filter on rather than comparing to another list. You'd then have to add a couple of attributes and calculate the x,y coordinates.

If you just want the centers of the countys, or more properly centroids, you can download a county shapefile and use GIS software to create those points and again calculate x,y attributes.

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That second link had precisely what I was looking for, thank you. –  Caimen Jun 25 at 17:28

Free TIGER County Shapefile, not sure what software you use, but Feature to Point in ArcMAP will give you center points from the county shapefile.

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I'm not familiar with that software, but I believe Google Maps API should have a similar function. I'll look around. –  Caimen Jun 24 at 20:09

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