MZ
Mary Zimmerman — 1940 US Census Record
Model Tree available1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this Mary Zimmerman across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed), with identified parents Mary & Roy — first a daughter (b.~1916), then head of a 5-person household.
Age 24
b. ~1916
Female
Daughter
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Zimmerman |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 23 Ballenger |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Clerk |
| Industry | Drug Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 220 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Clerk |
| Township / Ward | Election District 23 Ballenger |
| Est. Birth Year | ~1916 |
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 |
|---|---|---|---|---|
| Minerva Zimmerman | Daughter | — | 21 | ~1919 |
| Mary Zimmerman | Daughter | — | 24 | ~1916 |
| Roy Zimmerman | Head | — | 59 | ~1881 |
| Helen Harwood | Other | — | 7 | ~1933 |
| Mary Zimmerman | Spouse | — | 59 | ~1881 |
Census Appearances
1920
Frederick, Maryland
Daughter, age 3
Frederick, Maryland · implied b. ~1917 — 6 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Zimmerman |
| Given Name | Mary J |
| 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
Frederick, Maryland
Daughter, age 13
Frederick, Maryland · implied b. ~1917 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Zimmerman |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 13 |
| 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
Frederick-County, Maryland
Daughter, age 24
Frederick-County, Maryland · implied b. ~1916 — 5 household members
| Surname | Zimmerman |
| Given Name | Mary C. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 24 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Election District 23 Ballenger |
| 1935 Residence (County) | Frederick |
| Occupation | Clerk |
| Industry | Drug Store |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 220 |
| Highest Grade | No 7 |
| 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 Zimmerman across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: mother Mary Zimmerman (~0.92 confidence) and father Roy Zimmerman (~0.92 confidence) and father Edgar Zimmerman (~0.92 confidence) and mother Nellie Zimmerman (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Mother
Mary Zimmerman
b. ~1881
Source mother
● Household
· direct · ~0.92
Father
Roy Zimmerman
b. ~1881
Source father
● Household
· direct · ~0.92
Father
Edgar Zimmerman
b. ~1893
Source father
● Household
· direct · ~0.92
Mother
Nellie Zimmerman
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Zimmerman
Daughter · 1940 · age 24 · b. ~1916 · Maryland
★ You are viewing this record
Sibling
Minerva Zimmerman
Sibling · 1940 · age 21
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-t0627-01549-00613)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Annie B. V. Bussard | 67 | Wife | Housewife | Maryland |
| 2 | Merritt H. Alexander | 29 | Head | Operator | Florida |
| 3 | Grace C. Alexander | 29 | Head | Operator | Florida |
| 4 | Jay V. Alexander | 3 | Son | — | Maryland |
| 5 | Willard J. Kemp | 56 | Head | Blacksmith | Maryland |
| 6 | Virgie M. Kemp | 50 | Wife | Housewife | Maryland |
| 7 | H. Kathleen Kemp | 19 | Daughter | Helper | Maryland |
| 8 | Bessie V. Kemp | 17 | Daughter | Helper | Maryland |
| 9 | Eden Ronald F. Kemp | 25 | Son | Laborer | Maryland |
| 10 | Roy H. Zimmerman | 59 | Head | Operator | Maryland |
| 11 | Mary C. Zimmerman | 59 | Wife | Housewife | Maryland |
| 12 | Mary C. Zimmerman THIS PERSON | 24 | Daughter | Clerk | Maryland |
| 13 | Minerva I. Zimmerman | 21 | Daughter | House Maid | Maryland |
| 14 | Helen R. Harwood | 7 | Servant | — | Maryland |
| 15 | Ella C. Hawker | 67 | Head | House Wife | Maryland |
| 16 | Charles E. Zimmerman | 26 | Head | Operator | Maryland |
| 17 | Glenna M. Zimmerman | 23 | Wife | Housewife | Ohio |
| 18 | Thomas J. Zimmerman | 2 | Son | — | Maryland |
| 19 | Margaret R. Zimmerman | 70 | Mother | Housewife | Maryland |
| 20 | Russell E. Rice | 23 | Head | Baker | Maryland |
| 21 | Margaret E. Rice | 19 | Wife | Housewife | Maryland |
| 22 | Russell E. Jr. Rice | 1 | Son | — | Maryland |
| 23 | Harry F. Kimes | 35 | Head | Operator | Maryland |
| 24 | Madeline M. Kimes | 32 | Wife | Housewife | Maryland |
| 25 | Phyllis P. Kimes | 10 | Daughter | — | Maryland |
| 26 | Charles W. Kimes | 83 | Father | Retired | Maryland |
| 27 | Myrtle N. Kimes | 52 | Mother | Superintendent | Maryland |
| 28 | Harvey L. Zimmerman | 64 | Head | Farmer | Maryland |
| 29 | Mary E. Zimmerman | 63 | Wife | House Wife | Maryland |
| 30 | John W. Zimmerman | 24 | Son | Laborer | Maryland |
| 31 | George M. Harwood | 39 | Son in law | Laborer | Maryland |
| 32 | Margaret E. Harwood | 15 | Grand daughter | School | Maryland |
| 33 | Catherine M. Harwood | 13 | Grand daughter | — | Maryland |
| 34 | John T. Harwood | 9 | Grand son | — | Maryland |
| 35 | Mary C. M. Hargett | 29 | Boarder | House Maid | Maryland |
| 36 | Charles L. Hargett | 13 | Boarder | — | Maryland |
| 37 | Luther F. Hargett | 10 | Boarder | — | Maryland |
| 38 | Oliver Doran | 59 | Boarder | Laborer | Pennsylvania |
| 39 | Elmer S. Derr | 62 | Head | Operator | Maryland |
| 40 | Daisy M. Derr | 54 | Wife | Housewife | Maryland |
Pedigree Summary
Mary + 1 sibling
Gen 1 · 4 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)