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Mary Mayer — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Mayer across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 7-person household.
Age 16
b. ~1924
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Mayer |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore city |
| 1935 Residence (County) | Baltimore city |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same House |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1924 |
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.
7 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Lena Mayer | Daughter | — | 14 | ~1926 |
| Mary Mayer | Daughter | — | 16 | ~1924 |
| Peter Mayer | Head | — | 54 | ~1886 |
| Dominik Mayer | Son | — | 20 | ~1920 |
| Jack Mayer | Son | — | 9 | ~1931 |
| John Mayer | Son | — | 18 | ~1922 |
| Elizabeth Mayer | Spouse | — | 54 | ~1886 |
Census Appearances
1930
Baltimore, Maryland
Daughter, age 7
Baltimore, Maryland · implied b. ~1923 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mayers |
| Given Name | Marjorie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | South Carolina |
| Mother's Birthplace | Virginia |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 16
Baltimore-City-County, Maryland · implied b. ~1924 — 7 household members
| Surname | Mayer |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore city |
| 1935 Residence (County) | Baltimore city |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same House |
| 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 Mayer across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Mayer
Daughter · 1940 · age 16 · b. ~1924 · Maryland
★ You are viewing this record
Sibling
Jack Mayer
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Mayer
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Dominik Mayer
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lena Mayer
Sibling · 1940 · age 14
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 — Baltimore-City-County, Maryland
Open full size
1940 US Federal Census — Baltimore-City-County, Maryland
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-01531-00633)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | William A Baron | 28 | Head | Laborer | Maryland |
| 2 | Marie E Baron | 26 | Wife | — | Maryland |
| 3 | William A Jr Baron | 4 | Son | — | Maryland |
| 4 | Arthur C Sr Horst | 34 | Head | Watchman | Maryland |
| 5 | Mildred E Horst | 25 | Wife | — | Maryland |
| 6 | Arthur C Jr Horst | 8 | Son | — | Maryland |
| 7 | Helen B Leisure | 69 | Aunt | — | Maryland |
| 8 | Joseph M Cascio | 35 | Head | Laborer | Maryland |
| 9 | Margaret R Cascio | 30 | Wife | — | Penna |
| 10 | Geneva E Cascio | 10 | Daughter | — | Maryland |
| 11 | Irwin Schlegel | 46 | Head | Operator | Maryland |
| 12 | Nettie M Schlegel | 44 | Wife | — | Maryland |
| 13 | Thomas C Schlegel | 24 | Son | Mail Nurse | Maryland |
| 14 | Charles C Schultz | 46 | Head | Stationery Engineer | Penna |
| 15 | Genevieve E Schultz | 43 | Wife | — | Penna |
| 16 | Ruth G Schultz | 19 | Daughter | — | Maryland |
| 17 | Charles D Schultz | 18 | Son | — | Maryland |
| 18 | James J Beech | 33 | Head | Maintenance | Maryland |
| 19 | Josephine D Beech | 29 | Wife | — | Maryland |
| 20 | James B Beech | 4 | Son | — | Maryland |
| 21 | Daniel J Beech | 5 | Son | — | Maryland |
| 22 | Gerhart Knoepfler | 68 | Head | — | Germany |
| 23 | Dora M Knoepfler | 65 | Wife | — | Germany |
| 24 | Walter E Donce | 36 | Head | Cab Driver | Maryland |
| 25 | Emma J Donce | 29 | Wife | — | Maryland |
| 26 | Rosalie A Donce | 11 | Daughter | — | Maryland |
| 27 | Lester C Randle | 41 | Head | Pipe Fitter | Maryland |
| 28 | Myrtle D Randle | 21 | Wife | Clerk | Maryland |
| 29 | Lillian E Randle | 19 | Daughter | — | Maryland |
| 30 | Marion L Randle | 11 | Daughter | — | Maryland |
| 31 | Nellie N Randle | 6 | Daughter | — | Maryland |
| 32 | Peter Mayer | 54 | Head | Blacksmith Helper | Hungary |
| 33 | Elizabeth Mayer | 54 | Wife | — | Hungary |
| 34 | Dominik Mayer | 20 | Son | Welder App | Maryland |
| 35 | John Mayer | 18 | Son | Huckster | Maryland |
| 36 | Mary Mayer THIS PERSON | 16 | Daughter | — | Maryland |
| 37 | Lena Mayer | 14 | Daughter | — | Maryland |
| 38 | Jack P Mayer | 9 | Son | — | Maryland |
| 39 | Arnold W Richardson | 41 | Head | Steam Fitter | 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)