JC
John Crowley — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Prince-George'S-County, Maryland
Our Model Tree links this John Crowley across the 1930 and 1940 US Censuses in Prince-George'S-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 7-person household.
Age 15
b. ~1925
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Prince-George'S-County, Maryland |
| Surname | Crowley |
| Given Name | John S. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Hyattsville |
| 1935 Residence (County) | Prince Georges |
| Additional Details | |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Hyattsville |
| Est. Birth Year | ~1925 |
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 |
|---|---|---|---|---|
| Paul Crowley | Son | — | 5 | ~1935 |
| Richard Crowley | Son | — | 2 | ~1938 |
| William Crowley | Son | — | 8 | ~1932 |
| Frederick Crowley | Son | — | 10 | ~1930 |
| John Crowley | Head | — | 42 | ~1898 |
| Rosetta Crowley | Spouse | — | 33 | ~1907 |
| John Crowley | Son | — | 15 | ~1925 |
Census Appearances
1930
Prince George, …
Son, age 5
Prince George, Maryland · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Crowley |
| Given Name | John S. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Virginia |
| Mother's Birthplace | West Virginia |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Prince-George'S-County, Maryland
Son, age 15
Prince-George'S-County, Maryland · implied b. ~1925 — 7 household members
| Surname | Crowley |
| Given Name | John S. Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Hyattsville |
| 1935 Residence (County) | Prince Georges |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| 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 John Crowley across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Crowley
Son · 1940 · age 15 · b. ~1925 · Maryland
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Sibling
William Crowley
Sibling · 1940 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Paul Crowley
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Crowley
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Frederick Crowley
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Prince-George'S-County, Maryland
Open full size
1940 US Federal Census — Prince-George'S-County, Maryland
Page Contents
7 people indexed on this census page (nara:1940:m-t0627-01557-00698)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John S. Crowley | 42 | Head | Electrician | Virginia |
| 2 | Rosetta Crowley | 33 | Wife | — | West Virginia |
| 3 | John S. Jr. Crowley THIS PERSON | 15 | Son | — | Maryland |
| 4 | Frederick Crowley | 10 | Son | — | Dist of Col |
| 5 | William Crowley | 8 | Son | — | Dist of Col |
| 6 | Paul Crowley | 5 | Son | — | Dist of Col |
| 7 | Richard Crowley | 2 | Son | — | Dist of Col |
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)