JL
John Lamb — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Dallas-County, Iowa
Our Model Tree links this John Lamb across the 1930 and 1940 US Censuses in Dallas-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1889), then head of a 10-person household.
Age 51
b. ~1889
Male
Head
Born: Iowa
Married
1940 Census Record Details
| Census Year | 1940 |
| Location | Dallas-County, Iowa |
| Surname | Lamb |
| Given Name | John P |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Redfield Town |
| 1935 Residence (County) | Dallas |
| Additional Details | |
| Occupation | WPA Threshing Dist |
| Industry | Road Grading Project |
| Class of Worker | GW |
| Hours Worked | 2 |
| Income (1939) | 989 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Wpa Threshing Dist |
| Township / Ward | Redfield Town |
| Est. Birth Year | ~1889 |
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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Margaret Lamb | Daughter | — | 17 | ~1923 |
| Kenneth Lamb | Son | — | 9 | ~1931 |
| Eleanor Lamb | Daughter | — | 15 | ~1925 |
| Raymond Lamb | Son | — | 5 | ~1935 |
| Donna Lamb | Daughter | — | 7 | ~1933 |
| Nora Lamb | Spouse | — | 47 | ~1893 |
| John Lamb | Head | — | 51 | ~1889 |
| Harold Lamb | Son | — | 13 | ~1927 |
| Dorothy Lamb | Daughter | — | 19 | ~1921 |
| Eugene Lamb | Son | — | 11 | ~1929 |
Census Appearances
1930
Dallas, Iowa
Head, age 40
Dallas, Iowa · implied b. ~1890 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Lamb |
| Given Name | John A |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 40 |
| Marital Status | Married |
| Birthplace | Iowa |
| Age at First Marriage | 21 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Occupation | Fireman |
| Industry | Brick factory |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 15 |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dallas-County, Iowa
Head, age 51
Dallas-County, Iowa · implied b. ~1889 — 10 household members
| Surname | Lamb |
| Given Name | John P |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 51 |
| Marital Status | Married |
| Birthplace | Iowa |
| 1935 Residence (City) | Redfield Town |
| 1935 Residence (County) | Dallas |
| Occupation | WPA Threshing Dist |
| Industry | Road Grading Project |
| Class of Worker | GW |
| Hours Worked | 2 |
| Income (1939) | 989 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
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 Lamb across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Lamb
Head · 1940 · age 51 · b. ~1889 · Iowa
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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 — Dallas-County, Iowa
Open full size
1940 US Federal Census — Dallas-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01153-00619)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | John B Ward | 62 | Head | Carpenter | Iowa |
| 2 | Katherine Ward | 60 | Wife | — | Iowa |
| 3 | John Jr Ward | 24 | Son | Truck Driver | Iowa |
| 4 | Lillian Mrs Norton | 68 | Head | — | Missouri |
| 5 | Emma B Larson | 84 | Head | — | Iowa |
| 6 | John H Lipton | 79 | Head | Retired | Iowa |
| 7 | Callie Lipton | 80 | Wife | — | Iowa |
| 8 | John P Lamb THIS PERSON | 51 | Head | Wpa Threshing Dist | Iowa |
| 9 | Nora Lamb | 47 | Wife | — | Iowa |
| 10 | Dorothy Lamb | 19 | Daughter | — | Iowa |
| 11 | Margaret Lamb | 17 | Daughter | — | Iowa |
| 12 | Eleanor Lamb | 15 | Daughter | — | Iowa |
| 13 | Harold Lamb | 13 | Son | — | Iowa |
| 14 | Eugene Lamb | 11 | Son | — | Iowa |
| 15 | Kenneth Lamb | 9 | Son | — | Iowa |
| 16 | Donna Lamb | 7 | Daughter | — | Iowa |
| 17 | Raymond Lamb | 5 | Son | — | Iowa |
| 18 | Helmer Christensen | 40 | Head | Laborer | Iowa |
| 19 | Pearl Christensen | 34 | Wife | — | Iowa |
| 20 | Ardis Christensen | 10 | Daughter | — | Iowa |
| 21 | Billie Christensen | 9 | Son | — | Iowa |
| 22 | Harold Christensen | 5 | Son | — | Iowa |
| 23 | Wiley Parsons | 68 | Head | Salesman | Virginia |
| 24 | Adah Parsons | 46 | Wife | — | Nebraska |
| 25 | Mary Ellen Parsons | 23 | Daughter | — | Nebraska |
| 26 | Martha K Riggs | 26 | Lodger | Teaching | Iowa |
| 27 | Mildred J Leland | 19 | Lodger | Teaching | Nebraska |
| 28 | Esther Mclaughlin | 22 | Lodger | Teaching | Minnesota |
| 29 | Evelyn V Landeberg | 24 | Lodger | Teaching | Iowa |
| 30 | Alvin E Marrow | 40 | Head | Mail Clerk | Virginia |
| 31 | Edna Marrow | 37 | Wife | — | Iowa |
| 32 | Alvin Jr Marrow | 17 | Son | — | Iowa |
| 33 | Marilyn Marrow | 14 | Daughter | — | Iowa |
| 34 | Donald Marrow | 12 | Son | — | Iowa |
| 35 | Theodore Marrow | 10 | Son | — | Iowa |
| 36 | Shirley Marrow | 8 | Daughter | — | Iowa |
| 37 | Melvin H Dalen | 42 | Head | Salesman | Minnesota |
| 38 | Gertrude Dalen | 32 | Wife | — | Iowa |
| 39 | Betty Dalen | 14 | Niece | — | Iowa |
| 40 | Phyllis Bruggen | 22 | Lodger | Teaching | Iowa |
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)