Colby is located close to the center of Wisconsin. Colby is between the Clark, Marathon county. Colby has 1.56 square miles of land area and 0.01 square miles of water area. As of 2010-2014, the total Colby population is 1,788, which has grown 10.64% since 2000. The population growth rate is higher than the state average rate of 6.73% and is lower than the national average rate of 11.61%. Colby median household income is $38,750 in 2010-2014 and has grown by 12.91% since 2000. The income growth rate is much lower than the state average rate of 20.43% and is much lower than the national average rate of 27.36%. Colby median house value is $96,300 in 2010-2014 and has grown by 32.46% since 2000. The house value growth rate is lower than the state average rate of 47.86% and is lower than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Colby is worse than the state average in quality. The Colby area code is 715.