JB
John Blackwell — 1940 US Census Record
Model Tree available1940 United States Federal Census · Montgomery-County, Pennsylvania
Our Model Tree links this John Blackwell across the 1920, 1930 and 1940 US Censuses in Montgomery-County, Pennsylvania (XGBoost, ~Confirmed), with identified parents Edward & Ellen — first a son (b.~1919), then head of a 3-person household.
Age 21
b. ~1919
Male
Son
Born: Pennsylvania
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Montgomery-County, Pennsylvania |
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Penllyn |
| Additional Details | |
| Occupation | farm-hand |
| Industry | farm |
| Class of Worker | PW |
| Income (1939) | 300 |
| Highest Grade | No 4-2 |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Farm-Hand |
| Township / Ward | Penllyn |
| Est. Birth Year | ~1919 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Catherine Blackwell | Other | — | 22 | ~1918 |
| Edward Blackwell | Head | — | 45 | ~1895 |
| John Blackwell | Son | — | 21 | ~1919 |
Census Appearances
1920
Montgomery, Pennsylvania
Son, age
Montgomery, Pennsylvania · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | John M. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | Black |
| Age | 0 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | none |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1930
Montgomery, Pennsylvania
Son, age 10
Montgomery, Pennsylvania · implied b. ~1920 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Blackwell |
| Given Name | John M. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Montgomery-County, Pennsylvania
Son, age 21
Montgomery-County, Pennsylvania · implied b. ~1919 — 3 household members
| Surname | Blackwell |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 21 |
| Marital Status | Married |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Penllyn |
| Occupation | farm-hand |
| Industry | farm |
| Class of Worker | PW |
| Income (1939) | 300 |
| Highest Grade | No 4-2 |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
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 Blackwell across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Edward Blackwell (~0.92 confidence) and mother Ellen Blackwell (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Edward Blackwell
b. ~1895
Source father
● Household
· direct · ~0.92
Mother
Ellen Blackwell
b. ~1899
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Blackwell
Son · 1940 · age 21 · b. ~1919 · Pennsylvania
★ 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 — Montgomery-County, Pennsylvania
Open full size
1940 US Federal Census — Montgomery-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03579-00651)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Martha Moore | 7 | Grand-daughter | — | Republic of Panama |
| 2 | Samuel Williams | 65 | Head | Pipe-Fitter | Virginia |
| 3 | Julia Williams | 62 | Wife | — | Virginia |
| 4 | Nelson Stewart | 69 | Head | Labor | Virginia |
| 5 | Mary Stewart | 61 | Wife | — | Virginia |
| 6 | Joseph Stewart | 37 | Son | Labor | Pennsylvania |
| 7 | Hattie Stewart | 37 | Daughter-in-law | — | Virginia |
| 8 | Gloria Stewart | 6 | Grand-daughter | — | Pennsylvania |
| 9 | Joseph Jr. Stewart | 4 | Grand-son | — | Pennsylvania |
| 10 | Nelson J. Stewart | 2 | Grand-son | — | Pennsylvania |
| 11 | Marie Antoinette Stewart | 0 | Grand-daughter | — | Pennsylvania |
| 12 | Lillian E. Stewart | 40 | Daughter | House Work | Pennsylvania |
| 13 | Mckinley Jones | 42 | Head | Labor | Pennsylvania |
| 14 | Naddie Jones | 40 | Wife | — | Pennsylvania |
| 15 | Charles Jones | 21 | Son | — | Pennsylvania |
| 16 | James Jones | 20 | Son | Assistant-Draft Work | Pennsylvania |
| 17 | Mary Jones | 17 | Daughter | — | Pennsylvania |
| 18 | George H. Williams | 42 | Head | Truck Driver | Pennsylvania |
| 19 | Frances Williams | 39 | Wife | — | Pennsylvania |
| 20 | Estoria Williams | 19 | Daughter | — | Pennsylvania |
| 21 | Herbert Williams | 16 | Son | — | Pennsylvania |
| 22 | Nannie Williams | 16 | Daughter | — | Pennsylvania |
| 23 | Bernard Williams | 12 | Son | — | Pennsylvania |
| 24 | George Williams | 10 | Son | — | Pennsylvania |
| 25 | Frances Williams | 7 | Daughter | — | Pennsylvania |
| 26 | Edgar Williams | 2 | Son | — | Pennsylvania |
| 27 | Edward Blackwell | 45 | Head | Labor | Virginia |
| 28 | John Blackwell THIS PERSON | 21 | Son | Farm-Hand | Pennsylvania |
| 29 | Catherine Blackwell | 22 | Daughter-in-law | — | Pennsylvania |
| 30 | Thomas Wilson | 52 | Head | Watchman | Virginia |
| 31 | Bessie B. Wilson | 55 | Wife | — | Virginia |
| 32 | Moses Stewart | 38 | Head | Carpenter | Pennsylvania |
| 33 | Ida Stewart | 37 | Wife | — | Pennsylvania |
| 34 | George Stewart | 15 | Son | — | Pennsylvania |
| 35 | Jacqueline Stewart | 12 | Daughter | — | Pennsylvania |
| 36 | Alvera Stewart | 9 | Daughter | — | Pennsylvania |
| 37 | Richard Stewart | 5 | Son | — | Pennsylvania |
| 38 | Frances Nelson | 53 | Head | — | Virginia |
| 39 | George Nelson | 35 | Son | Paint-Mixer | Virginia |
| 40 | Andrew Nelson | 29 | Son | Labor | Pennsylvania |
Pedigree Summary
John
Gen 1 · 2 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)