MF
Mary Foster — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-County, Maryland
Our Model Tree links this Mary Foster across the 1920, 1930 and 1940 US Censuses in Baltimore-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 2-person household.
Age 51
b. ~1889
Female
Head
Born: Maryland
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-County, Maryland |
| Surname | Foster |
| Given Name | Mary B. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 14 |
| 1935 Residence (County) | Baltimore |
| Additional Details | |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Election District 14 |
| Est. Birth Year | ~1889 |
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.
2 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Foster | Head | — | 51 | ~1889 |
| William Foster | Son | — | 18 | ~1922 |
Census Appearances
1920
Baltimore, Maryland
Head, age 31
Baltimore, Maryland · implied b. ~1889 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Foster |
| Given Name | Mary A |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | Black |
| Age | 31 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Maid |
| Industry | Private Family |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | R |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Head, age 40
Baltimore, Maryland · implied b. ~1890
●
Primary link
· ~Confirmed · 1 source
XGBoost
| Surname | Foster |
| Given Name | Mary |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 40 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Machine Operator |
| Industry | Overall factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Veteran | 10 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-County, Maryland
Head, age 51
Baltimore-County, Maryland · implied b. ~1889 — 2 household members
| Surname | Foster |
| Given Name | Mary B. |
| Relationship to Head | Head |
| Sex | F |
| Color / Race | White |
| Age | 51 |
| Marital Status | Widowed |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 14 |
| 1935 Residence (County) | Baltimore |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Foster across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Foster
Head · 1940 · age 51 · b. ~1889 · Maryland
★ 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 — Baltimore-County, Maryland
Open full size
1940 US Federal Census — Baltimore-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01506-01085)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Anna B. Drummond | 58 | Wife | — | Pennsylvania |
| 2 | Joseph Day | 50 | Head | Sergeant | Maryland |
| 3 | Lillian Day | 41 | Wife | — | Maryland |
| 4 | William Day | 23 | Son | Conveyor | Maryland |
| 5 | Elizabeth Day | 16 | Daughter | — | Maryland |
| 6 | Lillian Day | 16 | Daughter | — | Maryland |
| 7 | Melvin Day | 14 | Son | — | Maryland |
| 8 | Andrew German | 64 | Head | — | Maryland |
| 9 | William German | 40 | Son | Machinist | Maryland |
| 10 | Virginia Seidler | 35 | Daughter | — | Maryland |
| 11 | John Seidler | 39 | Son-in-law | Laborer | Maryland |
| 12 | Evelyn Seidler | 14 | Granddaughter | — | Maryland |
| 13 | Howard C. Evans | 50 | Head | — | Maryland |
| 14 | Marie E. Evans | 38 | Wife | — | Maryland |
| 15 | Walter H. Evans | 15 | Son | — | Maryland |
| 16 | John Evans | 13 | Son | — | Maryland |
| 17 | Alberta P. Evans | 12 | Daughter | — | Maryland |
| 18 | James E. Evans | 8 | Son | — | Maryland |
| 19 | Joseph Evans | 5 | Son | — | Maryland |
| 20 | Raymond Evans | 4 | Son | — | Maryland |
| 21 | Howard C. Evans | 3 | Son | — | Maryland |
| 22 | Hilda Evans | 2 | Daughter | — | Maryland |
| 23 | Leona Evans | 0 | Daughter | — | Maryland |
| 24 | Edward M. Evans | 55 | Brother | Hunter | Maryland |
| 25 | John A. Lammeth | 47 | Head | Baker | Maryland |
| 26 | Mary A. Lammeth | 48 | Wife | — | Maryland |
| 27 | John Albert Lammeth | 18 | Son | Messenger | Maryland |
| 28 | John W. Lammeth | 18 | Son-step | Messenger | Maryland |
| 29 | George Lammeth | 17 | Son | Baker | Maryland |
| 30 | Helen M. Lammeth | 15 | Step-Daughter | — | Maryland |
| 31 | Joann G. Lammeth | 13 | Step-Daughter | — | Maryland |
| 32 | Caroline Foster | 72 | Head | — | Maryland |
| 33 | Charles A. Foster | 41 | Son | Shearman | Maryland |
| 34 | Charles A. Foster | 24 | Head | Assistant Manager | Maryland |
| 35 | Vivian V. Foster | 23 | Wife | Cashier Clerk | Ohio |
| 36 | Charles A. Foster | 3 | Son | — | Maryland |
| 37 | Mary B. Foster THIS PERSON | 51 | Head | — | Maryland |
| 38 | William B. Foster | 18 | Son | Laborer | Maryland |
| 39 | Alexander Hardt-Kidd | 23 | Head | — | Maryland |
| 40 | Margaret E. Hardt-Kidd | 50 | Wife | — | Maryland |
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)