The city of Milner encompasses the following counties: Lamar.
Milner encompasses land area: 1.4 sq mi (3.6 km2), water area: 0 sq mi (0 km2). The elevation is 840 ft (256 m) above sea level. This equates to a population density of 372.9/sq mi (145/km2). The local time zone is Eastern (EST) (UTC-5).
Local area codes are 770. The Federal Information Processing Standard (FIPS) code for the city is 13-51604, which is used in computer filings when non-government agencies and contractors fulfill government contracts.