Any county not listed for this state is $37 unless otherwise indicated.
 
1870 Census
Colorado - $37 each county 

1880 Census
Colorado - $37 each county except as follows:
           $57 each for the counties of  Summit, Weld
           $97 for the county of Arapahoe 

1900 Census 
Colorado - $37 each county except as follows:
       The county of Arapahoe  (including City of Denver) is
       not available at this time
   (contact host through "Comments" for way to reduce this cost        
   significantly)

1910 Census 
Colorado - $27 for the counties of: 
                Conejos, Huerfano 
           $37 each county except for the following:
   The county of Denver Cty. (including City of Denver) is not 
   available at this time
           $97 for the county of Weld
   (use "Comments" to contact us for way to reduce cost of populous   
   counties)

1920 Census
Colorado - $27 each for the counties of: Adams, Bent, Alamosa, 
                  Arapahoe, Archuleta, Baca, Chaffee, Cheyenne, Clear 
                  Creek, Conejos, Costilla, Crowley, Custer, Dolores,
                  Douglas, Eagle, Grand, Elbert, Gunnison, Garfield, 
                  Gilpin, Jackson, Kiowa, Kit Carson, Lincoln, Logan, 
                  Mineral, Moffat, Montezuma, Montrose, Morgan, Ouray,
                  Park, Phillips, Pitkin, Powers, Rio Blanco, Rio 
                  Grande, Routt, San Juan, Summit, Saguache, San 
                  Miguel, Sedgwick, Teller, Weld      
           $37 each for the counties of: Delta, Fremont, Hinsdale, 
                  Huerfano, Jefferson, Lake, La Plata, Mesa, Otero, 
                  Washington, Yuma
           $57 each for the counties of: Boulder, El Paso, Larimer, 
                  Las Animas
           $97 for the county of: Pueblo County and City of Denver are 
                  not currently available.