1900 Census - Fayette County, Pennsylvania
George TWP - 5 June 1900

  61 62
  Field, Calvin  Head W M Apr 1863 37 M 17     Penn Penn WVa  Day Laborer
  May W.         Wife W F Jun 1865 34 M 17 3 3 Penn Penn Penn
  Leroy B.       Son  W M Sep 1884 15 S        Penn Penn Penn Day Laborer
  Otto R.        Son  W M Jun 1887 12 S        Penn Penn Penn At School
  Willie C.      Son  W M Nov 1895  4 S        Penn Penn Penn

I became curious when noticing the change in surname between Calvin Field and his son Otto Field, and
so pushed back the line one generation.  See Calvin Field's parents for the 1880 Census.

From Jim Emme:

Otto (R.) Fields, b 19 Jun 1888 in Fairchance, married with wife and child in 1917---wwi reg
 
Otto Fields, b 19 Jun 1888, d Jun 1968 in Fairchance, Fayette, PA---SSDI
 
William C. Fields, b 4 Nov 1895 in Fairchance, single in 1917---wwi reg
 
1910 PA  Fayette  George
 
/53/54  Fields, Mae W.  head  widow  42  3 of 4   PAx3
        Leroy B.        son   single 26             "         rr brakeman
        Otto R.         son    "     21             "         coal miner
        William C.      son "        16             "         general laborer
        McLaughlin, Mary A. mother  widow  72  3 of 4   PAx3