48421 is zip code located in Columbiaville, Michigan. The population is 6,800, making 48421 the largest zipcode in Columbiaville and the 5th largest in Lapeer County.
There are 1 public schools in 48421 with an average Homefacts rating of A-. , and there are 14 registered sex offenders residing in the zip code 48421. Unemployment in 48421 is moderate.