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I have geocoded a series of addresses using ArcMap 10.5. The Geographic Coordinate System under the properties is:

Geographic Coordinate System: GCS_WGS_1984 Datum: D_WGS_1984 Prime Meridian: Greenwich Angular Unit: Degree

I just want to confirm that the EPSG code for this is 4326, because when I did some googling I ran into a lot of EPSG codes for slightly different variations of the projection WGS 84, and am a bit confused as a result

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  • Back when 10.5.1 was released, 4326 didn't refer to a "family" of GCS, so you're good.
    – Vince
    May 18 at 13:45

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Yes, 4326 is the standard epsg code for latitude/longitude geographic coordinate system using the WGS 84 datum.

Looking at the link you included I think you may be confusing geographic vs projected coordinate systems and datums vs coordinate systems. A datum is basically a model of the Earth (base ellipsoid model combined with geoid model of sea level).

A geographic coordinate system takes the datum to describes locations on that datum in terms of spherical coordinates (e.g. latitude/longitude). EPSG 4326 describes the geographic coordinate system using WGS 84 and the Greenwich meridian.

A projection can then be used to flatten the spherical 3D Earth into a 2D map. They all are built off of a geographic coordinate system and datum.

If you want to read further, Esri has a good blog post on some of these geodesy nuances.

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