WC
William Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Harford-County, Maryland
Our Model Tree links this William Cooper across the 1920, 1930 and 1940 US Censuses in Harford-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1899), then head of a 4-person household.
Age 41
b. ~1899
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Harford-County, Maryland |
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Aberdeen Town |
| 1935 Residence (County) | Harford |
| Additional Details | |
| Occupation | Steward |
| Industry | Post Exchange |
| Class of Worker | GW |
| Hours Worked | 42 |
| Income (1939) | 732 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Steward |
| Township / Ward | Aberdeen Town |
| Est. Birth Year | ~1899 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| William Cooper | Head | — | 41 | ~1899 |
| Eugene Cooper | Son | — | 14 | ~1926 |
| Franklin Cooper | Son | — | 16 | ~1924 |
| Annette Cooper | Spouse | — | 34 | ~1906 |
Census Appearances
1920
Harford, Maryland
Other, age 20
Harford, Maryland · implied b. ~1900 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | Willie Lee |
| Relationship to Head | Boarder |
| Sex | M |
| Color / Race | Black |
| Age | 20 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Helper |
| Class of Worker | W |
| Can Read | No |
| Can Write | No |
| Speaks English | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Harford, Maryland
Other, age 28
Harford, Maryland · implied b. ~1902 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Grandson-in-law |
| Sex | M |
| Color / Race | Black |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 26 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Trackman |
| Industry | Railroad |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Harford-County, Maryland
Head, age 41
Harford-County, Maryland · implied b. ~1899 — 4 household members
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 41 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Aberdeen Town |
| 1935 Residence (County) | Harford |
| Occupation | Steward |
| Industry | Post Exchange |
| Class of Worker | GW |
| Hours Worked | 42 |
| Income (1939) | 732 |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links William Cooper across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
William Cooper
Head · 1940 · age 41 · b. ~1899 · Maryland
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Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Harford-County, Maryland
Open full size
1940 US Federal Census — Harford-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01551-00187)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Ester Smith | 36 | Wife | Maid | Maryland |
| 2 | Ester Smith | 14 | daughter | — | Maryland |
| 3 | Norman Beckman | 27 | Head | Crossman | Maryland |
| 4 | Mary D. Beckman | 24 | wife | — | New Jersey |
| 5 | Betty Jean Beckman | 4 | daughter | — | Maryland |
| 6 | Charles A. Beckman | 1 | daughter | — | Maryland |
| 7 | Fred Airhow | 37 | Head | Mechanic | Maryland |
| 8 | Pearl Airhow | 30 | wife | — | North Carolina |
| 9 | Elizabeth Airhow | 57 | sister | — | Maryland |
| 10 | John Airhow | 20 | brother | Auto Mechanic | Maryland |
| 11 | Clarence Furguson | 23 | lodger | Crossman | Maryland |
| 12 | J. C. Rev. Moore | 50 | Head | Clergyman | Maryland |
| 13 | Mabel Moore | 26 | wife | — | Maryland |
| 14 | Mary O'Brien | 42 | Housekeeper | Housekeeper | Missouri |
| 15 | S. Millard Osborne | 59 | Head | Cashier | Maryland |
| 16 | Virginia V. Osborne | 55 | wife | — | Maryland |
| 17 | Gertrude Osborne | 32 | daughter | — | Maryland |
| 18 | Nelly Pleasant | 33 | maid | Maid | Virginia |
| 19 | Charles H. Osborne | 49 | Head | Farmer | Maryland |
| 20 | Mildred Osborne | 45 | wife | — | Maryland |
| 21 | Edna Osborne | 20 | daughter | Secretary | Maryland |
| 22 | Charles B. Iii Osborne | 23 | son | — | Maryland |
| 23 | Edna M. Osborne | 22 | daughter-in-law | Secretary | Maryland |
| 24 | Elizabeth Billingsley | 81 | mother-in-law | — | Maryland |
| 25 | George Adams | 52 | Head | Partner | Maryland |
| 26 | Ethel Adams | 20 | daughter | — | Maryland |
| 27 | George Jr. Adams | 13 | son | — | Maryland |
| 28 | Gustav Blodig | 27 | lodger | — | Czechoslovakia |
| 29 | Fredrick O. Vick | 63 | Head | Lumber Merchant | Pennsylvania |
| 30 | Florence J. Vick | 62 | wife | — | Maryland |
| 31 | Fredrick J. Vick | 24 | son | Bookkeeper | Maryland |
| 32 | Florence Jamison | 73 | mother-in-law | — | Maryland |
| 33 | Frank L. Drew | 67 | Head | Mechanic | Maryland |
| 34 | Katherine B. Drew | 60 | wife | — | Illinois |
| 35 | Edith Ganner | 44 | Head | Stenographer | Maryland |
| 36 | Dorothy Kahl | 35 | partner | Typist | Maryland |
| 37 | William Cooper THIS PERSON | 41 | Head | Steward | Maryland |
| 38 | Annette Cooper | 34 | wife | — | Maryland |
| 39 | Franklin Cooper | 16 | son | — | Maryland |
| 40 | Eugene Cooper | 14 | son | — | Maryland |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)