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Jack Davis — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Boulder-County, Colorado
Our Model Tree links this Jack Davis across the 1930 and 1940 US Censuses in Boulder-County, Colorado (XGBoost, ~Confirmed) — first a son (b.~1920), then head of a 10-person household.
Age 20
b. ~1920
Male
Son
Born: Wyoming
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Boulder-County, Colorado |
| Surname | Davis |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Wyoming |
| 1935 Residence (City) | Longmont |
| 1935 Residence (County) | Boulder |
| Additional Details | |
| Occupation | New Worker |
| Class of Worker | GW |
| Hours Worked | 20 |
| Income (1939) | 300 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
| Occupation | New Worker |
| Township / Ward | Longmont |
| Est. Birth Year | ~1920 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Jack | Age | Birth yr |
|---|---|---|---|---|
| Richard Davis | Son | — | 16 | ~1924 |
| William Davis | Son | — | 15 | ~1925 |
| Jack Davis | Son | — | 20 | ~1920 |
| Garry Davis | Son | — | 18 | ~1922 |
| Rita Davis | Daughter | — | 11 | ~1929 |
| Janet Davis | Daughter | — | 7 | ~1933 |
| Regis Davis | Son | — | 13 | ~1927 |
| Dorothy Davis | Spouse | — | 49 | ~1891 |
| Joan Davis | Daughter | — | 14 | ~1926 |
| Garry Davis | Head | — | 49 | ~1891 |
Census Appearances
1930
Boulder, Colorado
Son, age 10
Boulder, Colorado · implied b. ~1920 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Davis |
| Given Name | Jack A. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Wyoming |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Minnesota |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
1940
Boulder-County, Colorado
Son, age 20
Boulder-County, Colorado · implied b. ~1920 — 10 household members
| Surname | Davis |
| Given Name | Jack |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Wyoming |
| 1935 Residence (City) | Longmont |
| 1935 Residence (County) | Boulder |
| Occupation | New Worker |
| Class of Worker | GW |
| Hours Worked | 20 |
| Income (1939) | 300 |
| Highest Grade | Hs 4 |
| 1935 Residence | Same place |
| Birth State | Wyoming |
| Birth Country | United States |
| Birthplace (normalized) | wyoming |
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 Jack Davis across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Jack Davis
Son · 1940 · age 20 · b. ~1920 · Colorado
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Sibling
Janet Davis
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Regis Davis
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Rita Davis
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Davis
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Garry Davis
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Davis
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Davis
Sibling · 1940 · age 15
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 — Boulder-County, Colorado
Open full size
1940 US Federal Census — Boulder-County, Colorado
Page Contents
38 people indexed on this census page (nara:1940:m-t0627-00457-00968)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Vernon Schommer | 18 | Son | Book Binder | Minnesota |
| 2 | Myron Schommer | 16 | Son | — | Minnesota |
| 3 | Mervin Schommer | 16 | Son | — | Minnesota |
| 4 | Robert Schommer | 15 | Son | — | Colorado |
| 5 | Gerald Schommer | 11 | Son | — | Colorado |
| 6 | Joann Schommer | 8 | Daughter | — | Colorado |
| 7 | Cecil Schommer | 4 | Son | — | Colorado |
| 8 | Gynevra Beadle | 65 | Head | — | Colorado |
| 9 | Frances Beadle | 31 | Daughter | Bookkeeper | Colorado |
| 11 | Garry L. Davis | 49 | Head | Scale Man | Iowa |
| 12 | Dorothy R. Davis | 49 | Wife | — | Minnesota |
| 13 | Jack Davis THIS PERSON | 20 | Son | New Worker | Wyoming |
| 14 | Joan Davis | 14 | Daughter | Stenographer | Wyoming |
| 15 | Garry Jr. Davis | 18 | Son | Clerk | Colorado |
| 16 | Richard Davis | 16 | Son | — | Colorado |
| 17 | William Davis | 15 | Son | Paper Carrier | Colorado |
| 18 | Regis Davis | 13 | Son | — | Colorado |
| 19 | Rita Lou Davis | 11 | Daughter | — | Colorado |
| 20 | Janet Davis | 7 | Daughter | — | Colorado |
| 21 | Martin L. Blakeslee | 58 | Head | Road Maintainer | Colorado |
| 22 | Anna Blakeslee | 34 | Wife | — | New York |
| 23 | Adrian L. Wilson | 29 | Head | — | Oklahoma |
| 24 | Nina M. Wilson | 29 | Wife | — | Kansas |
| 25 | Janet Wilson | 7 | Daughter | — | Colorado |
| 26 | Carole Wilson | 6 | Daughter | — | Colorado |
| 27 | Ethel Ash | 49 | Head | Seamstress | Iowa |
| 28 | Jack L. Ash | 18 | Son | New Worker | Missouri |
| 29 | Anna Livings | 71 | Head | — | Kansas |
| 30 | John R. Newton | 28 | Head | Landscaper | Oklahoma |
| 31 | Lavene Newton | 27 | Wife | — | Kansas |
| 32 | Carole M. Newton | 5 | Daughter | — | Colorado |
| 33 | Andrew Early | 60 | Father-in-law | Miner | Illinois |
| 34 | Francis Brock | 14 | Head | Interior Decorator | Kansas |
| 35 | Joyce Brock | 20 | Wife | — | Colorado |
| 36 | Elbert H. Garner | 35 | Head | Mechanic | Missouri |
| 37 | Amy Garner | 33 | Wife | — | Oklahoma |
| 38 | Ralph Garner | 7 | Son | — | Colorado |
| 40 | Albert Andrew | 57 | Head | Stoker Tender | Missouri |
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)