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John Clarke — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Denver-County, Colorado
Our Model Tree links this John Clarke across the 1930 and 1940 US Censuses in Denver-County, Colorado (XGBoost, ~Confirmed) — first a head (b.~1896), then head of a 7-person household.
Age 44
b. ~1896
Male
Head
Born: Colorado
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Denver-County, Colorado |
| Surname | Clarke |
| Given Name | John D. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Widowed |
| Birthplace | Colorado |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Additional Details | |
| Occupation | Engineer |
| Industry | Steam R.R. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 322 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Engineer |
| Township / Ward | Denver |
| Est. Birth Year | ~1896 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Lillian Clarke | Daughter | — | 20 | ~1920 |
| George Clarke | Son | — | 11 | ~1929 |
| Mary Clarke | Daughter | — | 17 | ~1923 |
| Patricia Clarke | Daughter | — | 7 | ~1933 |
| Dolores Clarke | Daughter | — | 9 | ~1931 |
| John Clarke | Head | — | 44 | ~1896 |
| John Clarke | Son | — | 22 | ~1918 |
Census Appearances
1930
Denver, Colorado
Head, age 35
Denver, Colorado · implied b. ~1895 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John J. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 35 |
| Marital Status | Married |
| Birthplace | Colorado |
| Age at First Marriage | 21 |
| Father's Birthplace | Irish Free State |
| Mother's Birthplace | Irish Free State |
| Occupation | Engineer |
| Industry | Locomotive |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 12.00 |
| Radio Set | R |
| Veteran | No |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Denver-County, Colorado
Head, age 44
Denver-County, Colorado · implied b. ~1896 — 7 household members
| Surname | Clarke |
| Given Name | John D. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 44 |
| Marital Status | Widowed |
| Birthplace | Colorado |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Occupation | Engineer |
| Industry | Steam R.R. |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 322 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 John Clarke across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Clarke
Head · 1940 · age 44 · b. ~1896 · Colorado
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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 — Denver-County, Colorado
Open full size
1940 US Federal Census — Denver-County, Colorado
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00493-00306)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Dorothy A. Peterson | 17 | Daughter | 0 | Colorado |
| 42 | Robert A. Peterson | 15 | Son | 0 | Colorado |
| 43 | Lorraine E. Peterson | 13 | Daughter | 0 | Colorado |
| 44 | Joseph H. Rosenbach | 38 | Head | Welder | Kansas |
| 45 | Mary A. Rosenbach | 27 | Wife | 0 | Russia |
| 46 | John A. Rosenbach | 9 | Son | 0 | Colorado |
| 47 | James H. Rosenbach | 8 | Son | 0 | Colorado |
| 48 | Shirley J. Rosenbach | 4 | Daughter | 0 | Colorado |
| 49 | Joan Rosenbach | 2 | Daughter | 0 | Colorado |
| 50 | Bertha A. Anderson | 65 | Head | 0 | Sweden |
| 51 | Mildred A. Anderson | 22 | Daughter | Saleslady | Sweden |
| 52 | William H. Alleen | 25 | Boarder | 0 | Sweden |
| 53 | John E. Keefer | 45 | Head | Coach Cleaner | Colorado |
| 54 | Wilma E. Keefer | 25 | Wife | 0 | Nebraska |
| 55 | Donna V. Keefer | 3 | Daughter | 0 | Colorado |
| 56 | Robert J. Keefer | 0 | Son | 0 | Colorado |
| 57 | Laura A. Markey | 49 | Head | 0 | North Dakota |
| 58 | Richard N. Markey | 12 | Son | 0 | Colorado |
| 59 | Bertha A. Vaughn | 58 | Head | Servant | Iowa |
| 60 | Jarrie S. Wood | 73 | Head | 0 | Missouri |
| 61 | Alex H. King | 59 | Head | Proprietor | Kansas |
| 62 | Lola M. King | 54 | Wife | 0 | Nebraska |
| 63 | Elizabeth Nichols | 29 | Daughter | Saleslady | Kansas |
| 64 | Frederick Hoffman | 38 | Head | Fireman | Russia |
| 65 | Eleanor L. Hoffman | 27 | Wife | 0 | South Dakota |
| 66 | Joseph Wolf | 33 | Head | Clerk | Michigan |
| 67 | Ruth Wolf | 28 | Wife | Sales Bag | Colorado |
| 68 | Joseph Wolf | 1 | Son | 0 | Colorado |
| 69 | Marie C. Newblom | 74 | Lodger | 0 | Sweden |
| 70 | Clyde E. Hanes | 34 | Head | Care Taker | Nebraska |
| 71 | Ethel A. Hanes | 24 | Wife | 0 | Colorado |
| 72 | George H. Hanes | 5 | Son | 0 | Colorado |
| 73 | John D. Clarke THIS PERSON | 44 | Head | Engineer | Colorado |
| 74 | John D. Clarke | 22 | Son | 0 | Colorado |
| 75 | Lillian E. Clarke | 20 | Daughter | Marker | Colorado |
| 76 | Mary H. Clarke | 17 | Daughter | 0 | Colorado |
| 77 | George M. Clarke | 11 | Son | 0 | Colorado |
| 78 | Dolores H. Clarke | 9 | Daughter | 0 | Colorado |
| 79 | Patricia A. Clarke | 7 | Daughter | 0 | Colorado |
| 80 | Joseph Wintrich | 61 | Head | Furnace Operator | Yugoslavia |
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)