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William Zimmerman — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this William Zimmerman across the 1920, 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a head (b.~1864), then head of a 6-person household.
Age 76
b. ~1864
Male
Head
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Zimmerman |
| Given Name | William M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 76 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Frederick City |
| Est. Birth Year | ~1864 |
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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to William | Age | Birth yr |
|---|---|---|---|---|
| Madolyn Zimmerman | Daughter | — | 45 | ~1895 |
| William Zimmerman | Head | — | 76 | ~1864 |
| Austin Leonard | Other | — | 83 | ~1857 |
| E Leonard | Other | — | 40 | ~1900 |
| Raymond Zimmerman | Son | — | 47 | ~1893 |
| Margaret Zimmerman | Spouse | — | 42 | ~1898 |
Census Appearances
1920
Frederick, Maryland
Head, age 56
Frederick, Maryland · implied b. ~1864 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Zimmerman |
| Given Name | William M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 56 |
| Marital Status | Married |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Baker |
| Industry | Bakery |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Home Owned/Rented | O |
| Home Free/Mortgaged | M |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1930
Frederick, Maryland
Head, age 66
Frederick, Maryland · implied b. ~1864 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Zimmerman |
| Given Name | Willie G. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 66 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 21 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Can Read/Write | Yes |
| Home Owned/Rented | O |
| Home Value / Rent | 4000 |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Head, age 76
Frederick-County, Maryland · implied b. ~1864 — 6 household members
| Surname | Zimmerman |
| Given Name | William M. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 76 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Frederick City |
| 1935 Residence (County) | Frederick |
| Income (1939) | 0 |
| Highest Grade | H 4 |
| 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 William Zimmerman across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
William Zimmerman
Head · 1940 · age 76 · b. ~1864 · Maryland
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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
39 people indexed on this census page (nara:1940:m-t0627-01548-00332)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Harry Nogle | 24 | Nephew | Clerk | Maryland |
| 2 | Emma C. Zeluff | 66 | Head | — | Maryland |
| 3 | Eloise K. Zeluff | 25 | Daughter | — | Maryland |
| 4 | Rose Wertheimer | 71 | Sister | — | Maryland |
| 5 | William M. Zimmerman THIS PERSON | 76 | Head | — | Maryland |
| 6 | Madolyn Zimmerman | 45 | Daughter | Saleslady | Maryland |
| 7 | Raymond L. Zimmerman | 47 | Son | Music Teacher | Maryland |
| 8 | Margaret M. Zimmerman | 42 | Wife | — | Pennsylvania |
| 9 | Austin Leonard | 83 | Lodger | — | Maine |
| 10 | E. Louise Leonard | 40 | Lodger | French Teacher | Maine |
| 11 | Chester G. Clem | 60 | Head | Teacher | Maryland |
| 12 | Lola S. Clem | 51 | Wife | — | Maryland |
| 13 | Harold S. Clem | 31 | Son | English Teacher | Maryland |
| 14 | Ruth P. Clem | 23 | Daughter | — | Maryland |
| 15 | Lydia Frazer | 88 | Aunt | — | Maryland |
| 16 | Austin F. Foland | 27 | Head | Truck Driver | Maryland |
| 17 | Lillian B. Foland | 26 | Wife | — | Maryland |
| 18 | Janet Foland | 2 | Daughter | — | Maryland |
| 19 | Ronald Foland | 0 | Son | — | Maryland |
| 20 | Elizabeth Heckler | 65 | Mother | — | Pennsylvania |
| 21 | Harry E. Hahn | 71 | Head | — | Maryland |
| 22 | Mary L. Hahn | 65 | Wife | — | Maryland |
| 23 | Eileen Keefer | 19 | Daughter | — | Maryland |
| 24 | Daisy Foutty | 71 | Head | — | Maryland |
| 25 | Helena Wilhide | 50 | Head | Cook | Maryland |
| 26 | Margaret Wilhide | 25 | Daughter | Waitress | Maryland |
| 27 | L. Floyd Wise | 45 | Head | Watchmaker | Pennsylvania |
| 28 | Mabel Wise | 37 | Wife | — | Maryland |
| 29 | David Wise | 12 | Son | — | Maryland |
| 30 | Robert Ebert | 28 | Lodger | Motorcycle Mechanic | Maryland |
| 31 | Lloyd L. Roundtree | 35 | Head | Construction Supt. | California |
| 32 | Alpha Roundtree | 34 | Wife | — | Ohio |
| 33 | Betty Jean Roundtree | 11 | Daughter | — | Ohio |
| 34 | Barbara G. Roundtree | 9 | Daughter | — | California |
| 35 | Graham Roundtree | 8 | Son | — | California |
| 36 | Richard L. Roundtree | 4 | Son | — | California |
| 37 | Monroe B. Hahn | 32 | Head | Yard Manager | Maryland |
| 38 | Ethel Hahn | 28 | Wife | — | Maryland |
| 39 | Dolores Rice | 7 | Daughter | — | 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)