JH
John Hahn — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Frederick-County, Maryland
Our Model Tree links this John Hahn across the 1930 and 1940 US Censuses in Frederick-County, Maryland (XGBoost, ~Confirmed) — first a son (b.~1925), then head of a 14-person household.
Age 15
b. ~1925
Male
Son
Born: Maryland
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Frederick-County, Maryland |
| Surname | Hahn |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Brunswick |
| 1935 Residence (County) | Frederick |
| Additional Details | |
| Occupation | Clerk |
| Industry | Retail Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 100 |
| Highest Grade | No 6 |
| 1935 Residence | Same place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Clerk |
| Township / Ward | Brunswick |
| Est. Birth Year | ~1925 |
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.
14 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Patsy Hahn | Daughter | — | 6 | ~1934 |
| Mary Hahn | Daughter | — | 11 | ~1929 |
| Emory Hahn | Head | — | 47 | ~1893 |
| Doris Hahn | Daughter | — | 9 | ~1931 |
| Elliott Hahn | Son | — | 2 | ~1938 |
| Leon Hahn | Son | — | 20 | ~1920 |
| John Hahn | Son | — | 15 | ~1925 |
| Charles Hahn | Son | — | 22 | ~1918 |
| Fuller Hahn | Son | — | 13 | ~1927 |
| Lily Hahn | Spouse | — | 46 | ~1894 |
| Kenneth Hahn | Son | — | 10 | ~1930 |
| Douglas Hahn | Son | — | 18 | ~1922 |
| Melvin Hahn | Son | — | 16 | ~1924 |
| Hedley Hahn | Son | — | 5 | ~1935 |
Census Appearances
1930
Frederick, Maryland
Son, age 5
Frederick, Maryland · implied b. ~1925 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Hahn |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 5 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | none |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Frederick-County, Maryland
Son, age 15
Frederick-County, Maryland · implied b. ~1925 — 14 household members
| Surname | Hahn |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 15 |
| Marital Status | Single |
| Birthplace | Maryland |
| 1935 Residence (City) | Brunswick |
| 1935 Residence (County) | Frederick |
| Occupation | Clerk |
| Industry | Retail Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 100 |
| Highest Grade | No 6 |
| 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 John Hahn across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Hahn
Son · 1940 · age 15 · b. ~1925 · Maryland
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Sibling
Melvin Hahn
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leon Hahn
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fuller Hahn
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Hahn
Sibling · 1940 · age 22
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Hahn
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Patsy Hahn
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Hedley Hahn
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Kenneth Hahn
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Douglas Hahn
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Hahn
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elliott Hahn
Sibling · 1940 · age 2
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-t0627-01549-00678)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Nattie Fulcer | 62 | Sister-in-law | — | Maryland |
| 42 | William Woods | 82 | Father | — | Maryland |
| 43 | William Hammond | 51 | Head | Car Inspector | Washington D.C. |
| 44 | Pearl Hammond | 50 | Wife | — | Maryland |
| 45 | John Hammond | 22 | Son | — | Maryland |
| 46 | Robert Hammond | 20 | Son | — | Maryland |
| 47 | John Conner | 46 | Head | Machinist | Maryland |
| 48 | Evelyn Conner | 56 | Wife | — | Maryland |
| 49 | Emory Hahn | 47 | Head | Foreman | Maryland |
| 50 | Lily Hahn | 46 | Wife | — | Maryland |
| 51 | Charles Hahn | 22 | Son | Laborer | Maryland |
| 52 | Leon Hahn | 20 | Son | Truck Driver | Maryland |
| 53 | Douglas Hahn | 18 | Son | — | Maryland |
| 54 | Melvin Hahn | 16 | Son | — | Maryland |
| 55 | John Hahn THIS PERSON | 15 | Son | Clerk | Maryland |
| 56 | Fuller Hahn | 13 | Son | — | Maryland |
| 57 | Mary Virginia Hahn | 11 | Daughter | — | Maryland |
| 58 | Kenneth Hahn | 10 | Son | — | Maryland |
| 59 | Doris Hahn | 9 | Daughter | — | Maryland |
| 60 | Patsy Ann Hahn | 6 | Daughter | — | Maryland |
| 61 | Hedley Hahn | 5 | Son | — | Maryland |
| 62 | Elliott Hahn | 2 | Son | — | Maryland |
| 63 | Harry B. Dillow | 29 | Head | Laborer | Maryland |
| 64 | Hilton Anna Dillow | 22 | Daughter | Housekeeper | Maryland |
| 65 | James Beard | 65 | Head | Trucker | Virginia |
| 66 | Daisy B. Beard | 33 | Daughter | — | Maryland |
| 67 | Clearance Beard | 33 | Son-in-law | Laborer | Maryland |
| 68 | Jean Beard | 2 | Granddaughter | — | Maryland |
| 69 | George Barger | 75 | Head | Clerk | Maryland |
| 70 | Irene Barger | 70 | Wife | — | Virginia |
| 71 | Josephine Woods | 26 | Head | Housekeeper | Maryland |
| 72 | Mary Woods | 21 | Sister | Waitress | Maryland |
| 73 | Arlene Woods | 18 | Sister | Laborer | Maryland |
| 74 | Mary J. B. Woods | 79 | Grandmother | — | West Virginia |
| 75 | Harry Taulton | 36 | Head | Laborer | Maryland |
| 76 | Elizabeth Taulton | 25 | Wife | — | West Virginia |
| 77 | Patricia Taulton | 3 | Daughter | — | Maryland |
| 78 | Hillard Barger | 34 | Head | Coachman | Maryland |
| 79 | Virginia Barger | 33 | Wife | — | Maryland |
| 80 | Bertha Barger | 59 | Mother | — | 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)