MK
Mary Klein — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Baltimore-City-County, Maryland
Our Model Tree links this Mary Klein across the 1930 and 1940 US Censuses in Baltimore-City-County, Maryland (XGBoost, ~Confirmed) — first a spouse (b.~1901), then head of a 11-person household.
Age 39
b. ~1901
Female
Spouse
Born: Maryland
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Baltimore-City-County, Maryland |
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Additional Details | |
| Hours Worked | 0 |
| Highest Grade | G 5 |
| 1935 Residence | Same Place |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Township / Ward | Baltimore City |
| Est. Birth Year | ~1901 |
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.
11 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| William Klein | Son | — | 12 | ~1928 |
| Joan Klein | Daughter | — | 4 | ~1936 |
| George Klein | Son | — | 18 | ~1922 |
| John Klein | Head | — | 45 | ~1895 |
| Joseph Klein | Son | — | 2 | ~1938 |
| Jefferson Klein | Son | — | 19 | ~1921 |
| Mary Klein | Daughter | — | 16 | ~1924 |
| Margaret Klein | Daughter | — | 10 | ~1930 |
| Mary Klein | Spouse | — | 39 | ~1901 |
| Donald Klein | Son | — | 6 | ~1934 |
| Anna Klein | Daughter | — | 13 | ~1927 |
Census Appearances
1930
Baltimore, Maryland
Spouse, age 28
Baltimore, Maryland · implied b. ~1902 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Klein |
| Given Name | Mary E. |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 28 |
| Marital Status | Married |
| Birthplace | Maryland |
| Age at First Marriage | 15 |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1940
Baltimore-City-County, Maryland
Spouse, age 39
Baltimore-City-County, Maryland · implied b. ~1901 — 11 household members
| Surname | Klein |
| Given Name | Mary |
| Relationship to Head | Wife |
| Sex | F |
| Color / Race | White |
| Age | 39 |
| Marital Status | Married |
| Birthplace | Maryland |
| 1935 Residence (City) | Baltimore City |
| 1935 Residence (County) | Baltimore City |
| Hours Worked | 0 |
| Highest Grade | G 5 |
| 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 Klein across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Klein
Spouse · 1940 · age 39 · b. ~1901 · 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 — 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-t0627-01535-00380)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Doris Bayne | 11 | daughter | — | Maryland |
| 42 | Margaret Bayne | 9 | daughter | — | Maryland |
| 43 | Frances Bayne | 7 | daughter | — | Maryland |
| 44 | Charlotte Bayne | 4 | son | — | Maryland |
| 45 | John Klein | 45 | Head | Carpenter | Maryland |
| 46 | Mary Klein THIS PERSON | 39 | Wife | — | Maryland |
| 47 | Jefferson Klein | 19 | son | Press Operator | Maryland |
| 48 | George Klein | 18 | son | Box Catcher | Maryland |
| 49 | Mary Klein | 16 | daughter | — | Maryland |
| 50 | Anna M. Klein | 13 | daughter | — | Maryland |
| 51 | William Klein | 12 | son | — | Maryland |
| 52 | Margaret Klein | 10 | daughter | — | Maryland |
| 53 | Donald Klein | 6 | son | — | Maryland |
| 54 | Joan Klein | 4 | daughter | — | Maryland |
| 55 | Joseph Klein | 2 | son | — | Maryland |
| 56 | Lylock Morrison | 60 | Head | — | Virginia |
| 57 | Leora Morrison | 57 | Wife | — | Virginia |
| 58 | John Martin | 30 | Head | Printer | Maryland |
| 59 | Theresa Martin | 30 | Wife | Taylor | Maryland |
| 60 | Charles Hein | 49 | Head | Iron Molder | Maryland |
| 61 | Mildred Hein | 47 | Wife | — | Maryland |
| 62 | Charles Hein | 23 | son | Dry Cleaners | Maryland |
| 63 | Charlotte Hein | 20 | daughter | Housekeeper | Maryland |
| 64 | Louise Hein | 14 | daughter | — | Maryland |
| 65 | George Hein | 11 | son | — | Maryland |
| 66 | June Hein | 8 | daughter | — | Maryland |
| 67 | Anthony Jenkins | 40 | Head | Outside Machinist | Maryland |
| 68 | Grace Jenkins | 35 | Wife | Weaver | Maryland |
| 69 | Charles Reners | 35 | Head | Labor | Maryland |
| 70 | Emily Reners | 32 | Wife | Trotter | Maryland |
| 71 | James Pumphrey | 52 | brother in law | — | Maryland |
| 72 | William Argant | 52 | brother in law | Iron Molder | Maryland |
| 73 | Sarah Gray | 55 | Head | — | Maryland |
| 74 | Helen Fisher | 24 | Head | Waitress | Maryland |
| 75 | Paul R. Grump | 35 | Head | — | Maryland |
| 76 | Frederick C. Bayne | 46 | Head | Bartender | Maryland |
| 77 | Leolia A. Bayne | 43 | Wife | — | Maryland |
| 78 | Frederick C. Bayne | 23 | son | — | Maryland |
| 79 | Doris M. Bayne | 17 | daughter | — | Maryland |
| 80 | William Middleton | 19 | nephew | Packer | Maryland |
Related Census Records
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)