54421 is zip code located in Colby, Wisconsin. The population is 3,090, making 54421 the largest zipcode in Colby and the 5th largest in Clark County.
There are 4 public schools in 54421 with an average Homefacts rating of C+. , and there are 7 registered sex offenders residing in the zip code 54421. Unemployment in 54421 is low.