MW
Mary William — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Philadelphia-County, Pennsylvania
Our Model Tree links this Mary William across the 1930 and 1940 US Censuses in Philadelphia-County, Pennsylvania (XGBoost, ~Confirmed) — first a daughter (b.~1926), then head of a 8-person household.
Age 14
b. ~1926
Female
Daughter
Born: Delaware
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Philadelphia-County, Pennsylvania |
| Surname | William |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Delaware |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Additional Details | |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
| Township / Ward | Philadelphia City |
| Est. Birth Year | ~1926 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Hannah Henderson | Other | — | 35 | ~1905 |
| Betty William | Daughter | — | 5 | ~1935 |
| Bernie William | Head | — | 32 | ~1908 |
| Fred William | Son | — | 9 | ~1931 |
| Mary William | Daughter | — | 14 | ~1926 |
| Sarah William | Daughter | — | 4 | ~1936 |
| Joseph William | Son | — | 8 | ~1932 |
| Cecil Henderson | Other | — | 39 | ~1901 |
Census Appearances
1930
Philadelphia, Pennsylvania
Daughter, age 4
Philadelphia, Pennsylvania · implied b. ~1926 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Williams |
| Given Name | Marguerite |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 4 |
| Marital Status | Single |
| Birthplace | Delaware |
| Father's Birthplace | Delaware |
| Mother's Birthplace | Delaware |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
1940
Philadelphia-County, Pennsylvania
Daughter, age 14
Philadelphia-County, Pennsylvania · implied b. ~1926 — 8 household members
| Surname | William |
| Given Name | Mary Ann |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Delaware |
| 1935 Residence (City) | Philadelphia City |
| 1935 Residence (County) | Philadelphia |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Delaware |
| Birth Country | United States |
| Birthplace (normalized) | delaware |
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 Mary William across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary William
Daughter · 1940 · age 14 · b. ~1926 · Pennsylvania
★ You are viewing this record
Sibling
Sarah William
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fred William
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty William
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joseph William
Sibling · 1940 · age 8
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 — Philadelphia-County, Pennsylvania
Open full size
1940 US Federal Census — Philadelphia-County, Pennsylvania
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-03716-00501)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Dora Spencer | 45 | Head | General Housework | Virginia |
| 2 | Hattie Savage | 44 | Lodger | General Housework | Virginia |
| 3 | George Henry | 52 | Lodger | Hod Carrier | Virginia |
| 4 | Bernie William | 32 | Head | — | Virginia |
| 5 | Mary Ann William THIS PERSON | 14 | Daughter | — | Delaware |
| 6 | Fred William | 9 | Son | — | Delaware |
| 7 | Joseph William | 8 | Son | — | Delaware |
| 8 | Betty Jane William | 5 | Daughter | — | Delaware |
| 9 | Sarah E William | 4 | Daughter | — | Delaware |
| 10 | Cecil B Henderson | 39 | Lodger | Laborer | N. Carolina |
| 11 | Hannah Henderson | 35 | Lodger-wife | General Housework | Virginia |
| 12 | Arthur Purcell | 35 | Head | Laborer | N. Carolina |
| 13 | Florence Purcell | 37 | Wife | — | N. Carolina |
| 14 | Jesse Johnson | 45 | Lodger | Carpenter | S. Carolina |
| 15 | Reese Meekins | 37 | Head | — | Delaware |
| 16 | Mildred Meekins | 36 | Daughter | Hospital Aide | Pennsylvania |
| 17 | Helen Thomas | 20 | Granddaughter | General Housework | Pennsylvania |
| 18 | Ronald Thomas | 1 | Great grandson | — | Pennsylvania |
| 19 | Clarissa M Black | 27 | Head | — | Alabama |
| 20 | Josephine White | 50 | Mother | General Housework | Alabama |
| 21 | Robert Black | 8 | Son | — | Pennsylvania |
| 22 | Mildred Black | 5 | Daughter | — | Pennsylvania |
| 23 | Ronald Townsend | 50 | Head | Longshoreman | Maryland |
| 24 | Lucy Townsend | 45 | Wife | General Housework | West Virginia |
| 25 | Bettie Crompton | 31 | Head | Domestic | Virginia |
| 26 | Ruth Porter | 14 | Daughter | — | Maryland |
| 27 | Paul Austin | 25 | Head | Laborer | Pennsylvania |
| 28 | Lee Austin | 24 | Wife | Domestic | Pennsylvania |
| 29 | Elsie Gibson | 52 | Lodger | Domestic | Delaware |
| 30 | Harvey D Small | 76 | Head | Sexton | Pennsylvania |
| 31 | Anna M Small | 75 | Wife | — | Pennsylvania |
| 32 | Margaret Donaghy | 38 | Daughter | — | Pennsylvania |
| 33 | Margaret Donaghy | 10 | Daughter | — | Pennsylvania |
| 34 | Isaac Johnston | 60 | Head | Heat Installer | Scotland |
| 35 | Lillian Johnston | 54 | Wife | — | Pennsylvania |
| 36 | Irene Spalding | 45 | Sister-in-law | Bookkeeper | Pennsylvania |
| 37 | James Maclellan | 76 | Lodger | — | Nova Scotia |
| 38 | Jennie X Deane | 38 | Head | Adjustment Teacher | Pennsylvania |
| 39 | Audrey M Kent | 20 | Niece | — | Pennsylvania |
| 40 | Sydney Deane | 69 | Mother | — | Virginia |
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)