JF
John Foster — 1940 US Census Record
Model Tree available1940 United States Federal Census · Denver-County, Colorado
Our Model Tree links this John Foster across the 1910, 1920, 1930 and 1940 US Censuses in Denver-County, Colorado (XGBoost, ~Confirmed), with identified parents Dr & John — first a head (b.~1900), then head of a 4-person household.
Age 40
b. ~1900
Male
Head
Born: Colorado
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Denver-County, Colorado |
| Surname | Foster |
| Given Name | John W. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | City and County Denver |
| 1935 Residence (County) | Denver |
| Additional Details | |
| Occupation | Surgeon |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 492 |
| Highest Grade | C 5 |
| 1935 Residence | Same house |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Surgeon |
| Township / Ward | City And County Denver |
| Est. Birth Year | ~1900 |
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 John | Age | Birth yr |
|---|---|---|---|---|
| Kendall Foster | Daughter | — | 10 | ~1930 |
| John Foster | Head | — | 40 | ~1900 |
| Hugh Foster | Son | — | 12 | ~1928 |
| Margery Foster | Spouse | — | 38 | ~1902 |
Census Appearances
1910
Denver, Colorado
Son, age 10
Denver, Colorado · implied b. ~1900 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Foster |
| Given Name | John M. Jr. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | none |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1920
Denver, Colorado
Son, age 20
Denver, Colorado · implied b. ~1900 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Foster |
| Given Name | John Jr |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | none |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Denver, Colorado
Head, age 30
Denver, Colorado · implied b. ~1900 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Foster |
| Given Name | John M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Colorado |
| Age at First Marriage | 24 |
| Father's Birthplace | Tennessee |
| Mother's Birthplace | Tennessee |
| Occupation | Surgeon |
| Industry | Physician |
| Class of Worker | O |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 15000 |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Denver-County, Colorado
Head, age 40
Denver-County, Colorado · implied b. ~1900 — 4 household members
| Surname | Foster |
| Given Name | John W. Jr. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | City and County Denver |
| 1935 Residence (County) | Denver |
| Occupation | Surgeon |
| Industry | Private Practice |
| Class of Worker | OA |
| Hours Worked | 50 |
| Income (1939) | 492 |
| Highest Grade | C 5 |
| 1935 Residence | Same house |
| 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 Foster across 4 US Census years (1910, 1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Dr Foster (~0.92 confidence) and father John Foster (~0.92 confidence) and mother Bessie Foster (~0.92 confidence) and mother Bessie Foster (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Dr Foster
b. ~1864
Source father
● Household
· direct · ~0.92
Father
John Foster
b. ~1861
Source father
● Household
· direct · ~0.92
Mother
Bessie Foster
b. ~1872
Source mother
● Household
· direct · ~0.92
Mother
Bessie Foster
b. ~1865
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Foster
Head · 1940 · age 40 · b. ~1900 · Colorado
★ 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 — Denver-County, Colorado
Open full size
1940 US Federal Census — Denver-County, Colorado
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00487-00807)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Thomas K Reed | 5 | Son | — | Colorado |
| 2 | Paul Raymond Lindeman | 2 | Son | — | Colorado |
| 3 | Fern Spaulding | 19 | Maid | Housekeeper | Colorado |
| 4 | Ann Riedel | 49 | Servant | Servant | Russia |
| 5 | Arthur C. East | 33 | Head | Auto Mechanic | Colorado |
| 6 | Isabel M. East | 42 | Wife | — | Illinois |
| 7 | Marvin R. East | 16 | Son | — | Colorado |
| 8 | Justin B. East | 14 | Son | — | Colorado |
| 9 | Arthur G. Johnson | 47 | Head | Executive | Colorado |
| 10 | Helen K. Johnson | 43 | Wife | — | Massachusetts |
| 11 | Helen B. Johnson | 19 | Daughter | — | Colorado |
| 12 | Thelma E. Wells | 36 | Maid | Servant | Colorado |
| 13 | Norvilla Mathews | 50 | Cook | Cook | New York |
| 14 | Ann G. Ramsey | 60 | Head | — | Pennsylvania |
| 15 | Susie Butler | 65 | Maid | Housekeeper | Mississippi |
| 16 | Muriel Eaton | 29 | Daughter | — | New York |
| 17 | Cecil Walker | 65 | Head | — | Nebraska |
| 18 | Edna Walker | 53 | Wife | — | Nebraska |
| 19 | Gladys Roberts | 41 | Maid | Maid | Wisconsin |
| 20 | Lester A. Bowen | 25 | Maid | Labor | Colorado |
| 21 | Charles D. Link | 68 | Head | Executive | Indiana |
| 22 | Cora May Link | 70 | Wife | — | Ohio |
| 23 | Rachel L. Johnston | 40 | Daughter | — | Indiana |
| 24 | Reece Harper | 4 | Son | — | New York |
| 25 | Irene Frahm | 33 | Maid | Maid | Nebraska |
| 26 | Katherine Martin | 31 | Housekeeper | Housekeeper | Nebraska |
| 27 | Annie Snyder | 74 | Lodger | — | Kansas |
| 28 | Esther Zimmer | 70 | Head | — | New Zealand |
| 29 | Esther Z. Barber | 30 | Daughter | Operator | Colorado |
| 30 | Richard M. Barber | 29 | Son-in-law | Chicken & Egg Man | Colorado |
| 31 | John W. Jr. Foster THIS PERSON | 40 | Head | Surgeon | Colorado |
| 32 | Margery M. Foster | 38 | Wife | — | Canada English |
| 33 | Hugh B. Foster | 12 | Son | — | Colorado |
| 34 | Kendall Foster | 10 | Daughter | — | Colorado |
| 35 | Raymond Maxwell | 44 | Head | Sales Manager | Colorado |
| 36 | Ruth Maxwell | 43 | Wife | — | Colorado |
| 37 | Jean W. Maxwell | 19 | Daughter | — | Colorado |
| 38 | Joy E. Maxwell | 11 | Daughter | — | Colorado |
| 39 | Lucinda Lopez | 25 | Servant | — | New Mexico |
Pedigree Summary
John
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)