MC
Mary Callahan — 1940 US Census Record
Model Tree available1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Callahan across the 1920, 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed), with identified parents George & Mary — first a spouse (b.~1912), then head of a 4-person household.
Age 28
b. ~1912
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Callahan |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Income (1939) | 143 |
| Highest Grade | H 2 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1912 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Anna Callahan | Daughter | — | 3 | ~1937 |
| Alvin Callahan | Head | — | 28 | ~1912 |
| Howard Callahan | Other | — | 16 | ~1924 |
| Mary Callahan | Spouse | — | 28 | ~1912 |
Census Appearances
1920
Baltimore, Maryland
Daughter, age 8
Baltimore, Maryland · implied b. ~1912 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Baltimore, Maryland
Daughter, age 18
Baltimore, Maryland · implied b. ~1912 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Callahan |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Maryland |
| Age at First Marriage | 17 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Spooler |
| Industry | Seine Fact. |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Spouse, age 28
Baltimore-City-County, Maryland · implied b. ~1912 — 4 household members
| Surname | Callahan |
| Given Name | Mary E |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Income (1939) | 143 |
| Highest Grade | H 2 |
| 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 Callahan across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father George Callahan (~0.92 confidence) and mother Mary Callahan (~0.92 confidence) and mother Mary Callahan (~0.92 confidence). The pedigree spans 1 generation with 3 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
George Callahan
b. ~1877
Source father
● Household
· direct · ~0.92
Mother
Mary Callahan
b. ~1890
Source mother
● Household
· direct · ~0.92
Mother
Mary Callahan
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Callahan
Spouse · 1940 · age 28 · b. ~1912 · 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-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-t0627-01521-00197)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Elsie L Dowell | 46 | Wife | — | Maryland |
| 2 | William J Kelly | 57 | Lodger | Carpenter | Maryland |
| 3 | Lois A Baker | 21 | Niece | Telephone Op | Virginia |
| 4 | Alvin W Callahan | 28 | Head | — | Maryland |
| 5 | Mary E Callahan THIS PERSON | 28 | Wife | — | Maryland |
| 6 | Anna M Callahan | 3 | Daughter | — | Maryland |
| 7 | Howard M Callahan | 16 | Grandson | — | Maryland |
| 8 | Robert R Jr Parker | 50 | Head | Clerk | Maryland |
| 9 | Beulah J Parker | 45 | Wife | — | Maryland |
| 10 | Doris V Parker | 21 | Daughter | Sales Lady | Maryland |
| 11 | Robert R Parker | 14 | Son | — | Maryland |
| 12 | Katherine M Mcauley | 64 | Mother-in-law | — | Maryland |
| 13 | Emma J Thomas | 67 | Head | — | Maryland |
| 14 | Theresa A Thomas | 63 | Sister | Social Worker | Maryland |
| 15 | M Mercedes Maisel | 51 | Head | Social Worker | Brazil |
| 16 | Julia M Wagner | 50 | Lodger | — | Maryland |
| 17 | William H Puppet | 41 | Head | Acc. | Maryland |
| 18 | E. Betty Puppet | 35 | Wife | — | Maryland |
| 19 | William Jr Puppet | 7 | Son | — | Maryland |
| 20 | Tilden F Barnes | 41 | Head | Police | Maryland |
| 21 | Nita Jr Barnes | 36 | Wife | — | Maryland |
| 22 | Minnie M Barnes | 12 | Daughter | — | Maryland |
| 23 | Tilden Jr Barnes | 5 | Son | — | Maryland |
| 24 | Kenneth L Barnes | 3 | Son | — | Maryland |
| 25 | William J Jr Exter | 41 | Head | Plumber | Maryland |
| 26 | Elsie Exter | 42 | Wife | — | Maryland |
| 27 | William J Jr Exter | 18 | Son | Office Boy | Maryland |
| 28 | Robert P Exter | 16 | Son | — | Maryland |
| 29 | James F Exter | 15 | Son | — | Maryland |
| 30 | Raymond M Exter | 13 | Son | — | Maryland |
| 31 | Jane E Exter | 11 | Daughter | — | Maryland |
| 32 | Mary E Exter | 8 | Daughter | — | Maryland |
| 33 | Frederick H Wagner | 35 | Head | Railway | Maryland |
| 34 | Lola E Wagner | 30 | Wife | — | Maryland |
| 35 | Shirley F Wagner | 7 | Daughter | — | Maryland |
| 36 | Ronald P Wagner | 1 | Son | — | Maryland |
| 37 | William H Gubba | 54 | Head | — | Maryland |
| 38 | Cora M Gubba | 53 | Wife | Sales Lady | Pennsylvania |
| 39 | William W Gubba | 16 | Son | — | Maryland |
| 40 | J. Frank Smith | 40 | Head | Clerk | Maryland |
Pedigree Summary
Mary
Gen 1 · 3 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)