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William Cooper — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-County, Maryland
Our Model Tree links this William Cooper across the 1920, 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1888), then head of a 4-person household.
Age 52
b. ~1888
Male
Head
Born: England
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-County, Maryland |
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Election District 15 |
| 1935 Residence (County) | Baltimore |
| Naturalization Status | Naturalized |
| Additional Details | |
| Occupation | Carpenter |
| Industry | Shipyard |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 308 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| Birth Country | England |
| Birthplace (normalized) | england |
| Occupation | Carpenter |
| Township / Ward | Election District 15 |
| Est. Birth Year | ~1888 |
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 |
|---|---|---|---|---|
| Mary Davidson | Daughter | — | 16 | ~1924 |
| William Cooper | Head | — | 52 | ~1888 |
| Lloyd Davidson | Son | — | 21 | ~1919 |
| Bessie Cooper | Spouse | — | 48 | ~1892 |
Census Appearances
1920
Baltimore, Maryland
Head, age 31
Baltimore, Maryland · implied b. ~1889 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Cooper |
| Given Name | William J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 31 |
| Marital Status | Married |
| Birthplace | England |
| Year of Immigration | 1900 |
| Naturalization Status | First papers filed |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | Carpenter |
| Industry | Ship Yard |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth Country | England |
| Birthplace (normalized) | england |
1930
Baltimore, Maryland
Head, age 42
Baltimore, Maryland · implied b. ~1888 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Couper |
| Given Name | William J |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 42 |
| Marital Status | Married |
| Birthplace | England |
| Naturalization Status | Naturalized |
| Year of Immigration | 1904 |
| Age at First Marriage | 20 |
| Father's Birthplace | England |
| Mother's Birthplace | England |
| Occupation | Carpenter |
| Industry | Ship Yard |
| Class of Worker | W |
| Can Read/Write | Yes |
| Mother Tongue | English |
| Home Owned/Rented | O |
| Home Value / Rent | 4500 |
| Veteran | No |
| Birth Country | England |
| Birthplace (normalized) | england |
1940
Baltimore-County, Maryland
Head, age 52
Baltimore-County, Maryland · implied b. ~1888 — 4 household members
| Surname | Cooper |
| Given Name | William |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 52 |
| Marital Status | Married |
| Birthplace | England |
| 1935 Residence (City) | Election District 15 |
| 1935 Residence (County) | Baltimore |
| Naturalization Status | Naturalized |
| Occupation | Carpenter |
| Industry | Shipyard |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 308 |
| Highest Grade | 6 |
| 1935 Residence | Same house |
| Birth Country | England |
| Birthplace (normalized) | england |
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 52 · b. ~1888 · Maryland
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Baltimore-County, Maryland
Open full size
1940 US Federal Census — Baltimore-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01507-00464)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Klara Diehl | 1 | Daughter | — | Maryland |
| 2 | William Lang | 38 | Head | Truck Driver | Maryland |
| 3 | Elizabeth Lang | 36 | Wife | Truck Driver | Maryland |
| 4 | Minnie Lang | 15 | Daughter | — | Maryland |
| 5 | William, Jr. Lang | 14 | Son | — | Maryland |
| 6 | Margaret Lang | 11 | Daughter | — | Maryland |
| 7 | Henry Wagner | 25 | Nephew | Clerk | Maryland |
| 8 | Max Klemm | 64 | Head | Hardware | Germany |
| 9 | Meta Klemm | 61 | Wife | — | Germany |
| 10 | Ruth Robin | 37 | Head | — | Maryland |
| 11 | Bernard Robin | 18 | Son | — | Maryland |
| 12 | Harry Schaeffer | 42 | Head | Auto Mechanic | Pennsylvania |
| 13 | Anna Schaeffer | 38 | Wife | — | Maryland |
| 14 | Paul Sigman | 19 | Lodger | Helper | Ohio |
| 15 | Wayne Colburn | 28 | Head | Chauffeur | Michigan |
| 16 | Alberta Colburn | 26 | Wife | — | Maryland |
| 17 | Barbara Mae Colburn | 3 | Daughter | — | Maryland |
| 18 | Antony Spagnola | 44 | Head | Service Station | Italy |
| 19 | Elizabeth Spagnola | 34 | Wife | — | Italy |
| 20 | Rose Spagnola | 13 | Daughter | — | Maryland |
| 21 | Joseph Spagnola | 12 | Son | — | Maryland |
| 22 | Roy Camps | 43 | Head | Motor Tender | Italy |
| 23 | Minnie Camps | 32 | Wife | — | Maryland |
| 24 | Nicholas Camps | 16 | Son | Helper | Maryland |
| 25 | Filomena Camps | 14 | Daughter | — | Maryland |
| 26 | Roy, Jr. Camps | 12 | Son | — | Maryland |
| 27 | William Camps | 10 | Son | — | Maryland |
| 28 | Edith Thomas | 23 | Sister-in-law | Packer | Maryland |
| 29 | William Cooper THIS PERSON | 52 | Head | Carpenter | England |
| 30 | Bessie Cooper | 48 | Wife | — | Maryland |
| 31 | Lloyd Davidson | 21 | Son | Tool Maker | Maryland |
| 32 | Mary Elizabeth Davidson | 16 | Daughter | — | Maryland |
| 33 | George Lyle | 41 | Head | Mechanic | Maryland |
| 34 | Marion Lyle | 41 | Wife | — | Maryland |
| 35 | Georgia Lyle | 15 | Daughter | — | Maryland |
| 36 | George, Jr. Lyle | 13 | Son | — | Maryland |
| 37 | Joseph A. Thompson | 41 | Head | Foreman | Maryland |
| 38 | Bessie Thompson | 39 | Wife | — | Maryland |
| 39 | Earl Thompson | 19 | Son | — | Maryland |
| 40 | Betty Thompson | 14 | Daughter | — | 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)