MH
Mary Hamilton — 1940 US Census Record
Model Tree available1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Mary Hamilton across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed), with identified parents Theresa — first a daughter (b.~1911), then head of a 3-person household.
Age 29
b. ~1911
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Hamilton |
| Given Name | Mary N. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Secretary |
| Industry | Retail Grocery |
| Class of Worker | OA |
| Hours Worked | 44 |
| Income (1939) | 236 |
| Highest Grade | Hs 4 |
| 1935 Residence | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Secretary |
| Township / Ward | Frederick City |
| Est. Birth Year | ~1911 |
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.
3 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Mary Hamilton | Daughter | — | 29 | ~1911 |
| Theresa Hamilton | Head | — | 61 | ~1879 |
| Clinton Hamilton | Son | — | 33 | ~1907 |
Census Appearances
1920
X, Maryland
Other, age 9
X, Maryland · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Mary E |
| Relationship to Head | Ward |
| Sex | F |
| Color / Race | Black |
| Age | 9 |
| 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
Frederick, Maryland
Other, age 19
Frederick, Maryland · implied b. ~1911 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hamilton |
| Given Name | Mary M. |
| Sex | F |
| Color / Race | White |
| Age | 19 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Bookkeeper |
| Industry | Store 6790 |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Daughter, age 29
Frederick-County, Maryland · implied b. ~1911 — 3 household members
| Surname | Hamilton |
| Given Name | Mary N. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 29 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick |
| 1935 Residence (County) | Frederick |
| Occupation | Secretary |
| Industry | Retail Grocery |
| Class of Worker | OA |
| Hours Worked | 44 |
| Income (1939) | 236 |
| Highest Grade | Hs 4 |
| 1935 Residence | Maryland |
| 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 Hamilton across 3 US Census years (1920, 1930 and 1940) in 3 locations, using XGBoost record linkage. Identified parents: mother Theresa Hamilton (~0.92 confidence). The pedigree spans 1 generation with 1 identified ancestor.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Theresa Hamilton
b. ~1879
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Hamilton
Daughter · 1940 · age 29 · b. ~1911 · Maryland
★ You are viewing this record
Sibling
Clinton Hamilton
Sibling · 1940 · age 33
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 — Frederick-County, Maryland
Open full size
1940 US Federal Census — Frederick-County, Maryland
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01548-00138)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Larkin W. Miller | 49 | Head | Engraver | Tennessee |
| 2 | Ruby O. Miller | 46 | Wife | — | Virginia |
| 3 | Henry L. Davis | 38 | Head | Shipping Clerk | Maryland |
| 4 | Mildred G. Davis | 44 | Wife | — | Maryland |
| 5 | Sallie Highbarger | 74 | Mother-in-law | — | Maryland |
| 6 | Francis Mullinnix | 30 | Head | Proprietor | Maryland |
| 7 | Dorothy A. Mullinnix | 30 | Wife | — | Maryland |
| 8 | Martha Mullinnix | 9 | Daughter | — | Maryland |
| 9 | Barbara Mullinnix | 8 | Daughter | — | Maryland |
| 10 | Joyce Mullinnix | 3 | Daughter | — | Maryland |
| 11 | Alice Miller | 81 | Grandmother | — | Maryland |
| 12 | Lane H. Eigenbrode | 24 | Head | Clerk | Maryland |
| 13 | Irene L. Eigenbrode | 20 | Wife | — | Maryland |
| 14 | Lane H. Eigenbrode | 2 | Son | — | Maryland |
| 15 | Leslie H. Lyon | 51 | Head | Superintendent | Maryland |
| 16 | Isabelle H. Lyon | 44 | Wife | — | Maryland |
| 17 | Flora Lyon | 16 | Daughter | — | Maryland |
| 18 | Albert S. Lofness | 47 | Head | Turner | Maryland |
| 19 | Naomi D. Lofness | 38 | Wife | — | Maryland |
| 20 | Henry T. Lofness | 15 | Son | — | Maryland |
| 21 | Leonard D. Eigenbrode | 23 | Head | Farmer | Maryland |
| 22 | Pauline Eigenbrode | 25 | Wife | Cashier | Maryland |
| 23 | Ernest Martin | 32 | Head | Operator | Maryland |
| 24 | Helen Martin | 30 | Wife | — | Maryland |
| 25 | Gene Martin | 14 | Daughter | — | Maryland |
| 26 | Eva Jane Martin | 10 | Daughter | — | Maryland |
| 27 | Ernest H. Jr. Martin | 13 | Son | — | Maryland |
| 28 | Richard Martin | 12 | Son | — | Maryland |
| 29 | Richard Murdock | 27 | Head | Engineer | Maryland |
| 30 | Martha D. Murdock | 22 | Wife | — | Maryland |
| 31 | Richard J. Jr. Murdock | 1 | Son | — | Maryland |
| 32 | Edward Hanneberger | 38 | Head | Credit Inspector | Maryland |
| 33 | Pauline Hanneberger | 38 | Wife | — | Maryland |
| 34 | Edward Jr. Hanneberger | 15 | Son | — | Maryland |
| 35 | Theresa Hamilton | 61 | Head | — | Maryland |
| 36 | Clinton S. Hamilton | 33 | Son | Manager | Maryland |
| 37 | Mary N. Hamilton THIS PERSON | 29 | Daughter | Secretary | Maryland |
| 38 | Rufus Boyer | 35 | Head | Salesman | Maryland |
| 39 | Glenna Boyer | 36 | Wife | — | Maryland |
| 40 | Ernest Keefer | 40 | Head | Plumber | Maryland |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 1 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)