TJ
Thelma Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Delaware-County, Pennsylvania
Our Model Tree links this Thelma Johnson across the 1930 and 1940 US Censuses in Delaware-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1920), then head of a 11-person household.
Age 20
b. ~1920
Female
Daughter
Born: Pennsylvania
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Delaware-County, Pennsylvania |
| Surname | Johnson |
| Given Name | Thelma |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Upper Darby T. |
| 1935 Residence (County) | Delaware |
| Additional Details | |
| Occupation | Domestic |
| Industry | private family |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 40 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
| Occupation | Domestic |
| Township / Ward | Upper Darby T |
| 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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Thelma | Age | Birth yr |
|---|---|---|---|---|
| Alma Johnson | Daughter | — | 12 | ~1928 |
| Thelma Johnson | Daughter | — | 20 | ~1920 |
| Margaret Johnson | Daughter | — | 24 | ~1916 |
| Marie Johnson | Daughter | — | 18 | ~1922 |
| Bernard Johnson | Head | — | 52 | ~1888 |
| Robert Johnson | Son | — | 10 | ~1930 |
| James Johnson | Son | — | 14 | ~1926 |
| Norman Johnson | Son | — | 9 | ~1931 |
| Bernard Johnson | Son | — | 21 | ~1919 |
| George Johnson | Son | — | 16 | ~1924 |
| Mary Johnson | Spouse | — | 47 | ~1893 |
Census Appearances
1930
Chester, Pennsylvania
Daughter, age 11
Chester, Pennsylvania · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Thelma M |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| Father's Birthplace | Pennsylvania |
| Mother's Birthplace | Pennsylvania |
| Can Read/Write | Yes |
| Birth State | Pennsylvania |
| Birth Country | United States |
| Birthplace (normalized) | pennsylvania |
1940
Delaware-County, Pennsylvania
Daughter, age 20
Delaware-County, Pennsylvania · implied b. ~1920 — 11 household members
| Surname | Johnson |
| Given Name | Thelma |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Pennsylvania |
| 1935 Residence (City) | Upper Darby T. |
| 1935 Residence (County) | Delaware |
| Occupation | Domestic |
| Industry | private family |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 40 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| 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 Thelma Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Thelma Johnson
Daughter · 1940 · age 20 · b. ~1920 · Pennsylvania
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Sibling
Bernard Johnson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Johnson
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Alma Johnson
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marie Johnson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Johnson
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
George Johnson
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Margaret Johnson
Sibling · 1940 · age 24
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Norman Johnson
Sibling · 1940 · age 9
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 — Delaware-County, Pennsylvania
Open full size
1940 US Federal Census — Delaware-County, Pennsylvania
Page Contents
37 people indexed on this census page (nara:1940:m-t0627-03498-00551)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 3 | David Milligan | 43 | Head | Laborer | Pennsylvania |
| 4 | Martha Milligan | 42 | Wife | Packer | Pennsylvania |
| 5 | Alma Milligan | 18 | Daughter | Packer | Pennsylvania |
| 6 | David Milligan | 16 | Son | — | Pennsylvania |
| 7 | George Milligan | 11 | Son | — | Pennsylvania |
| 8 | Joseph Milligan | 7 | Son | — | Pennsylvania |
| 9 | Betty Milligan | 5 | Daughter | — | Pennsylvania |
| 10 | John Milligan | 2 | Son | — | Pennsylvania |
| 11 | William Guinan | 42 | Head | Card Runner | Pennsylvania |
| 12 | Mary Guinan | 37 | Wife | — | Pennsylvania |
| 13 | William, Jr. Guinan | 19 | Son | — | Pennsylvania |
| 14 | Frances Guinan | 17 | Daughter | Maid | Pennsylvania |
| 15 | Mary Guinan | 15 | Daughter | — | Pennsylvania |
| 16 | Austen Guinan | 13 | Son | — | Pennsylvania |
| 17 | George Guinan | 9 | Son | — | Pennsylvania |
| 18 | Dorothy Guinan | 4 | Daughter | — | Pennsylvania |
| 19 | Bernard L. Johnson | 52 | Head | Painter | Norway |
| 20 | Mary Johnson | 47 | Wife | — | Pennsylvania |
| 21 | Margaret Johnson | 24 | Daughter | Seamer | Pennsylvania |
| 22 | Bernard, Jr. Johnson | 21 | Son | Helper | Pennsylvania |
| 23 | Thelma Johnson THIS PERSON | 20 | Daughter | Domestic | Pennsylvania |
| 24 | Marie Johnson | 18 | Daughter | Domestic | Pennsylvania |
| 25 | George Johnson | 16 | Son | — | Pennsylvania |
| 26 | James Johnson | 14 | Son | — | Pennsylvania |
| 27 | Alma Johnson | 12 | Daughter | — | Pennsylvania |
| 28 | Robert Johnson | 10 | Son | — | Pennsylvania |
| 29 | Norman Johnson | 9 | Son | — | Pennsylvania |
| 30 | Clarence Heck | 37 | Head | Laborer | Pennsylvania |
| 31 | Amelle Heck | 27 | Wife | — | Pennsylvania |
| 32 | Dolores Heck | 6 | Daughter | — | Pennsylvania |
| 33 | John William Heck | 2 | Son | — | Pennsylvania |
| 34 | Harry Smith | 43 | Head | — | Pennsylvania |
| 35 | May Smith | 43 | Wife | Domestic | Pennsylvania |
| 36 | Harry, Jr. Smith | 20 | Son | Truck Driver | Pennsylvania |
| 37 | William L. Shepley | 65 | Head | Owner | Pennsylvania |
| 38 | Ivy Shepley | 60 | Wife | — | Pennsylvania |
| 39 | Hugh Shepley | 18 | Son | — | Pennsylvania |
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)