County Code
The third through fifth digits (501 in the example above) of the API number represent the county where the surface location of the well is located. The "pseudo-states" like Atlantic Coast Offshore have "pseudo-counties."
The "County Codes" are normally odd numbers. Delaware has the fewest counties (3) of any state, so its "County Codes" are Kent County (07-001), New Castle County (07-003), and Sussex County (07-005). Texas has the most counties of any state (254), so the "County Codes" range from Anderson County (42-001) to Zavala County (42-507).
The odd numbers were chosen for "County Codes" to allow expansion of the database. New counties were added in Arizona and New Mexico, and these were assigned even numbers. These include La Paz County, Arizona (02-012), Cibola County, New Mexico (30-006), and Los Alamos County, New Mexico (30-028).
Kern County, California has a well population that has exceeded the digits available for the "Unique Well Identifier" so 029 is used for the first 99,999 wells, and 030 is used for any additional wells . A list of counties and a downloadable Excel list that includes counties and "pseudo counties" is available from SPWLA
Read more about this topic: API Well Number
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