MP
Mary Peters — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Peters across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents John & Annie — first a daughter (b.~1914), then head of a 5-person household.
Age 26
b. ~1914
Female
Daughter
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Peters |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Highest Grade | No 8 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1914 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Peters | Daughter | — | 26 | ~1914 |
| Catherine Tierney | Daughter | — | 17 | ~1923 |
| John Tierney | Head | — | 57 | ~1883 |
| Paul Peters | Other | — | 27 | ~1913 |
| John Tierney | Son | — | 20 | ~1920 |
Census Appearances
1920
Baltimore, Maryland
Daughter, age 3
Baltimore, Maryland · implied b. ~1917 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peters |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Daughter, age 14
Baltimore, Maryland · implied b. ~1916 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Peters |
| Given Name | Mary K. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 14 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Daughter, age 26
Baltimore-City-County, Maryland · implied b. ~1914 — 5 household members
| Surname | Peters |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Highest Grade | No 8 |
| 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 Peters across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father John Tierney (~0.92 confidence) and mother Annie Peters (~0.92 confidence) and father John Peters (~0.92 confidence) and father Joseph Peters (~0.92 confidence) and mother Elizabeth Peters (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
John Tierney
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Annie Peters
b. ~1889
Source mother
● Household
· direct · ~0.92
Father
John Peters
b. ~1893
Source father
● Household
· direct · ~0.92
Father
Joseph Peters
b. ~1894
Source father
● Household
· direct · ~0.92
Mother
Elizabeth Peters
b. ~1894
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Peters
Daughter · 1940 · age 26 · b. ~1914 · Maryland
★ You are viewing this record
Sibling
John Tierney
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Catherine Tierney
Sibling · 1940 · age 17
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
40 people indexed on this census page (nara:1940:m-t0627-01508-00012)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Edward | 23 | Son | Operator | Pennsylvania |
| 2 | Bertha | 19 | Daughter | — | Pennsylvania |
| 3 | Stanley Jr | 17 | Son | Clerk | Pennsylvania |
| 4 | Melvin | 13 | Son | — | Maryland |
| 5 | Florence | 13 | Daughter | — | Maryland |
| 6 | Richard | 10 | Son | — | Maryland |
| 7 | Beatrice | 7 | Daughter | — | Maryland |
| 8 | John L Wiser | 43 | Head | Laborer | Maryland |
| 9 | Elizabeth M Wiser | 36 | Wife | — | Maryland |
| 10 | Dorothy M Wiser | 18 | Daughter | Soda Clerk | Maryland |
| 11 | William R Wiser | 40 | Brother | Shipping Clerk | Maryland |
| 12 | Edward Pfisterer | 30 | Head | Inspector | Maryland |
| 13 | Mildred Pfisterer | 28 | Wife | — | Maryland |
| 14 | Mamie Pfisterer | 63 | Mother | — | Maryland |
| 15 | Joseph Fullum | 66 | Head | — | Maryland |
| 16 | Anna Fullum | 66 | Wife | — | Ireland |
| 17 | Frank Coratti | 40 | Head | Tin Smith | Yugo Slavia |
| 18 | Marie Coratti | 38 | Wife | Pressing | Yugo Slavia |
| 19 | Marie Coratti | 15 | Daughter | — | Yugo Slavia |
| 20 | Mark Coratti | 10 | Son | — | Yugo Slavia |
| 21 | Ernest Schreiber | 24 | Head | Truck Operator | Maryland |
| 22 | Rose L Schreiber | 21 | Wife | Machine Operator | New York |
| 23 | George S Oberg | 29 | Head | Metalworker | Maryland |
| 24 | Erna L Oberg | 29 | Wife | — | Maryland |
| 25 | George S Jr Oberg | 2 | Son | — | Maryland |
| 26 | Gertrude Oberg | 52 | Head | Waitress | Maryland |
| 27 | Herman A Oberg | 23 | Son | Grinder | Maryland |
| 28 | Franklin M Oberg | 16 | Son | — | Maryland |
| 29 | John J Jr Tierney | 57 | Head | Refinisher | Maryland |
| 30 | John J Tierney | 20 | Son | — | Maryland |
| 31 | Catherine Tierney | 17 | Daughter | — | Maryland |
| 32 | Paul Peters | 27 | Son-in-law | Type Setter | Maryland |
| 33 | Mary Peters THIS PERSON | 26 | Daughter | — | Maryland |
| 34 | Charles A Sommers | 53 | Head | Painter | Maryland |
| 35 | Ella J Sommers | 47 | Wife | — | Maryland |
| 36 | Ella J Sommers | 17 | Daughter | — | Maryland |
| 37 | Charles H Jr Sommers | 13 | Son | — | Maryland |
| 38 | Sarah E Myers | 83 | Mother-in-law | — | Maryland |
| 39 | Earle H Sommers | 23 | Head | Tank Workman | Maryland |
| 40 | Rosa M Sommers | 19 | Wife | Seamstress | Maryland |
Pedigree Summary
Mary + 2 siblings
Gen 1 · 5 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)