Callao is located in Macon County, MO. The population is 297, making Callao the 5th largest city in Macon County.
There are 1 public schools in Callao with an average Homefacts rating of B+. The total crime rate for Callao is moderate, and there are 4 registered sex offenders residing in the city. Unemployment in Callao is low and the median home sales price is $0.