The city of Gardner encompasses the following counties: Johnson. Gardner's government is comprised of the Mayor, who is currently David Drovetta .
Gardner encompasses land area: 10.12 sq mi (26.21 km2), water area: 0.05 sq mi (0.13 km2). The elevation is 1,060 ft (323 m) above sea level. This equates to a population density of 1,889.6/sq mi (729.6/km2). The local time zone is Central (CST) (UTC-6).
Zip codes in Gardner include 66030-66031. Local area codes are 913. The Federal Information Processing Standard (FIPS) code for the city is 20-25425, which is used in computer filings when non-government agencies and contractors fulfill government contracts. Additional information and the official website of the city is found at GardnerKansas.gov.