61925 -- U.S. ZIP code Municipality (1990): DALTON CITY, Illinois All ZIPs for this municipality (1990): 61925 Population (2000): 924 Housing Units (2000): 353 Land area (2000): 41.652398 sq. miles (107.879210 sq. km) Water area (2000): 0.005925 sq. miles (0.015345 sq. km) Total area (2000): 41.658323 sq. miles (107.894555 sq. km) Located within: Illinois (IL) Location: 39.719012 N, 88.822274 W