Locate store hours, directions, address and phone number for the Tractor Supply Company store in Topeka, KS. We carry products for lawn and garden, livestock, pet care, equine, and more!. Zip code 66615 statistics: (Find on map) Estimated zip code population in 2016: 3,481 Zip code population in 2010: 2,814 Zip code population in 2000: 1,967 Mar. 2016 cost of living index in zip code 66615: 82.0 (low, U.S. average is 100) Land area: 45.3 sq. mi. Water area: 1.8 sq. mi..