63401 is zip code located in Hannibal, Missouri. The population is 21,229, making 63401 the largest zipcode in Hannibal and the largest in Marion County.
There are 10 public schools in 63401 with an average Homefacts rating of C+. , and there are 104 registered sex offenders residing in the zip code 63401. Unemployment in 63401 is low.