A few years after statehood, a constitutional amendment allowed them to be abolished on a county-by-county basis, and by the mid-1930s, all Oklahoma counties had voted to do so.

[3] According to the Oklahoma Constitution, a county can be disorganized if the sum of all taxable property is less than $2.5 million.

If so, then a petition must be signed by one-fourth of the population and then a vote would occur.

[4] The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided with each entry.

Oklahoma's postal abbreviation is OK and its FIPS state code is 40.