Incorporated in 1884 as a town - now has a population of more than 70,000. It covers an area of 27 square miles. The population for the Hammond trade area is approximately 165,000. H - United States Post Office and court House. A - American Legion Memorial, Harrison Park. M - Filtration Plant. M - Lever Bros. Soap Factory, near Hammond. O - Flower Beds in Harrison Park. N - Hammond City Hall. D - Civic Auditorium.