Any county not listed for this state is $37 unless otherwise indicated.
 
1790 Census
Maine - $57 for the state 

1800 Census
Maine - $57 each for the counties of Cumberland, Lincoln, 
                    Hancock, Kennebec, Washington, York

1810 Census
Maine - $37 each county

1820 Census
Maine - $57 each for the counties of Oxford, Washington, 
                    Penobscot, Somerset 
        $97 each for the counties of Kennebec, Lincoln,York
       $147 for the county of Cumberland 

1830 Census 
Maine - $57 each for the counties of Hancock, Oxford, Penobscot, 
                   Somerset, Waldo, Washington 
        $97 each for the counties of Cumberland, Kennebec, 
                   Lincoln, York
1840 Census
Maine - $97 each for the counties of Aroostook, Franklin, Hancock,
                   Piscataquis, Somerset, Washinton, Waldo
        $97 for the city of Portland  
       $147 for the counties of Cumberland (excluding the city of 
                   Portland), Kennebec, Lincoln, Oxford, Penobscot, 
                   York 
1850 Census 
Maine - $97 for the City of Portland (not included in any county) 
        $97 each for the counties of Aroostook, Franklin, 
                   Piscataquis            
       $147 each for the counties of Hancock, Oxford, Somerset,Waldo,
                   Washington   
       $197 each for the counties of Cumberland, Kennebec, Lincoln, 
                   Penobscot, York

1860 Census
Maine - $97 each county except as follows: 
       $147 each for the counties of Cumberland, Washington
       $197 each for the counties of Kennebec, Penobscot, York

1870 Census 
Maine - $97 each county except for the following:
       $147 each for the counties of Androscoggin, Hancock, Kennebec,
                   Oxford, Somerset, Waldo, Washington, York
       $197 for the county of Cumberland (excluding the city of 
                   Portland) 
       $297 for the county of Penobscot
    City of Portland - $27 each ward 
    City of Portland Islands - $37

1880 Census
Maine - $57 for the county of Franklin
        $97 each for the counties of Androscoggin, Hancock, Knox,
                   Lincoln, Oxford, Summerset, Waldo,Washington
       $197 each for the counties of Aroostook, Kennebec
       $297 each for the counties of Cumberland, Penobscot, York
    OR  $22 each Enumeration District (EDs) 

1900 Census 
Maine - $97 each county except as follows:
        $57 each for the counties of Knox, Piscataquis, Sagadahoc
       $197 each for the counties of Androscoggin, Kennebec, Lincoln,
                   Penobscot, York 
       $297 each for the counties of Cumberland
   (contact host through "Comments" for way to reduce this cost  
   significantly)

1910 Census
Maine - $97 each county except as follows:
        $57 each for the counties of Franklin, Knox, Lincoln, Oxford, 
                   Piscataquis, Sagadahoc, Summerset, Waldo, Washington
       $197 each for the counties of Aroostook, Kennebec, 
                   Penobscot, York 
       $297 each for the counties of Cumberland
  (use "Comments" to contact us for way to reduce cost of populous    
  counties)

1920 Census 
Maine - $57 each for the counties of Franklin, Knox, Lincoln,       
                   Piscataquis, 
                   Sagadahoc, Somerset, Waldo 
        $97 each for the counties of Hancock, Kennecbec, Oxford, 
                   Washington
       $147 each for the counties of Androscoggin, Aroostook, 
                   Penobscot, York
       $247 for the county of Cumberland
   (use "Comments" to get info on reducing cost of populous areas)