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Mary Lamb — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Johnson-County, Missouri
Our Model Tree links this Mary Lamb across the 1930 and 1940 US Censuses in Johnson-County, Missouri (XGBoost, ~Confirmed) — first a daughter (b.~1924), then head of a 9-person household.
Age 16
b. ~1924
Female
Daughter
Born: Missouri
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Johnson-County, Missouri |
| Surname | Lamb |
| Given Name | Mary K. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Warrensburg |
| 1935 Residence (County) | Johnson |
| Additional Details | |
| Occupation | Student |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Student |
| Township / Ward | Warrensburg |
| Est. Birth Year | ~1924 |
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.
9 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Peggy Lamb | Daughter | — | 3 | ~1937 |
| Warren Lamb | Daughter | — | 18 | ~1922 |
| Betty Lamb | Daughter | — | 11 | ~1929 |
| John Lamb | Son | — | 14 | ~1926 |
| Wm Lamb | Son | — | 9 | ~1931 |
| Will Lamb | Head | — | 56 | ~1884 |
| Wayne Lamb | Son | — | 6 | ~1934 |
| Mary Lamb | Daughter | — | 16 | ~1924 |
| Beulah Lamb | Spouse | — | 46 | ~1894 |
Census Appearances
1930
Johnson, Missouri
Daughter, age 6
Johnson, Missouri · implied b. ~1924 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lamb |
| Given Name | Mary E |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1940
Johnson-County, Missouri
Daughter, age 16
Johnson-County, Missouri · implied b. ~1924 — 9 household members
| Surname | Lamb |
| Given Name | Mary K. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Missouri |
| 1935 Residence (City) | Warrensburg |
| 1935 Residence (County) | Johnson |
| Occupation | Student |
| Income (1939) | 0 |
| Highest Grade | H-1 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Lamb across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Lamb
Daughter · 1940 · age 16 · b. ~1924 · Missouri
★ You are viewing this record
Sibling
Wm Lamb
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Wayne Lamb
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Lamb
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Peggy Lamb
Sibling · 1940 · age 3
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Warren Lamb
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Betty Lamb
Sibling · 1940 · age 11
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 — Johnson-County, Missouri
Open full size
1940 US Federal Census — Johnson-County, Missouri
Page Contents
31 people indexed on this census page (nara:1940:m-t0627-02120-00429)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | S. Marius Peterson | 59 | Head | Painter | Denmark |
| 2 | M. Sue Peterson | 45 | Wife | — | Missouri |
| 3 | Chad M. Peterson | 24 | Son | Teacher | Missouri |
| 4 | Henry Peterson | 21 | Son | — | Missouri |
| 5 | George Peterson | 16 | Son | Newspaper Carrier | Missouri |
| 6 | Bertha Sue Peterson | 13 | Daughter | — | Missouri |
| 7 | Will Lamb | 56 | Head | Building Carpenter | Missouri |
| 8 | Beulah Lamb | 46 | Wife | — | Missouri |
| 9 | Warren Lamb | 18 | Daughter | — | Missouri |
| 10 | Mary K. Lamb THIS PERSON | 16 | Daughter | Student | Missouri |
| 11 | John W. Lamb | 14 | Son | Student | Missouri |
| 12 | Betty Lou Lamb | 11 | Daughter | — | Missouri |
| 13 | Wm. Dean Lamb | 9 | Son | — | Missouri |
| 14 | Wayne W. Lamb | 6 | Son | — | Missouri |
| 15 | Peggy Ann Lamb | 3 | Daughter | — | Missouri |
| 16 | David R. Mcculley | 45 | Head | Salesman For Curtis Pub Co | Missouri |
| 17 | Cornelia Mcculley | 22 | Wife | — | Missouri |
| 18 | James P. Conn | 23 | Inmate | Oil Field Worker | Texas |
| 19 | Roscoe Janvier | 30 | Inmate | Farm Labor | Massachusetts |
| 20 | Wilburn Butler | 19 | Inmate | New Worker | Kansas |
| 21 | Frank Smith | 37 | Inmate | Common Labor | Missouri |
| 22 | Harold Smith | 36 | Inmate | Hotel Porter | Missouri |
| 23 | Dewey Van Natta | 34 | Inmate | Farm Labor | Missouri |
| 24 | Wilbur Halleck | 44 | Inmate | Pharmacist | Missouri |
| 25 | Blanton Gregory | 27 | Inmate | Farmer | Missouri |
| 26 | Kenneth Sims | 29 | Inmate | Baker | Missouri |
| 27 | H. Kent Stoll | 34 | Inmate | Building Carpenter | Missouri |
| 28 | Frank Conley | 45 | Inmate | Building Painter | Missouri |
| 29 | Albert A. Brown | 30 | Inmate | Building Construction | Missouri |
| 30 | Carl R. Taylor | 30 | Inmate | Building Contractor | Missouri |
| 31 | Goodwin | 35 | Inmate | Car Washer | Missouri |
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)