Cromwell has a post office with ZIP code 42333 , which opened on May 28 , 1846 .
The community is located on U.S. Route 231 6.5 miles ( 10.5 km ) southeast of Beaver Dam .
community has a post office with ZIP code 42333 , which opened on May 28 , 1846 .
The community is located on U.S. Route 231 6.5 miles ( 10.5 km ) southeast of Beaver Dam .