Denver. Streets. Blocks "Average 500 x 250 ft, but they vary; some 400 x 250, some 3000 x 250. There are other variations." City Engineer's Office Je 16, 1949 Blocks to the mile - Denver: Business district; 12 long blocks to the mile, 16 short blocks to the mile. Residence district; 10 long blocks to the mile, 16 short blocks to the mile. City Engineer, Denver Je 10, 1925