Which CRS could these coordinates be in?

Question

I'm looking at a dataset with polygons for the U.S. state of Kentucky. Most of the coordinate points are in WGS84 lat/longs (e.g. -82.910, 37.873) but a subset of these are in a different projection and look like this 1790295.890, 1125859.117.
I want to reproject this subset to WGS84 but I need to know the CRS I'm projecting from... Any pointers? I know these coordinate points look familiar; I've seen them before but don't remember the CRS they could belong to.

Ben · Accepted Answer

Those look like State Plane Coordinates.  I would start there.
Check out NAD83 Kentucky Single Zone first EPSG 3088.  Probably most likely if they are state wide data sets.
https://spatialreference.org/ref/epsg/3088/
for reference a few projected coordinates I always check are state plane systems (NAD83 and NAD27), UTM Zones, and Lambert Conformal Conic for continental us large areas.  Some states like Indiana now have county level systems too, so watch out for that.

Which CRS could these coordinates be in?

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