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Lawrence Smith — 1940 US Census Record
Model Tree available1940 United States Federal Census · Dubuque-County, Iowa
Our Model Tree links this Lawrence Smith across the 1920, 1930 and 1940 US Censuses in Dubuque-County, Iowa (XGBoost, ~Confirmed), with identified parents Joseph & Joe — first a son (b.~1919), then head of a 8-person household.
Age 21
b. ~1919
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Dubuque-County, Iowa |
| Surname | Smith |
| Given Name | Lawrence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Dodge Township |
| 1935 Residence (County) | Dubuque |
| Additional Details | |
| Income (1939) | 0 |
| Highest Grade | H-4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Dodge Township |
| Est. Birth Year | ~1919 |
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.
8 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Lawrence | Age | Birth yr |
|---|---|---|---|---|
| Mary Smith | Daughter | — | 15 | ~1925 |
| Monica Smith | Daughter | — | 17 | ~1923 |
| Evelyn Smith | Daughter | — | 13 | ~1927 |
| Joseph Smith | Head | — | 63 | ~1877 |
| Leonard Smith | Son | — | 27 | ~1913 |
| Lawrence Smith | Son | — | 21 | ~1919 |
| Louis Smith | Son | — | 23 | ~1917 |
| Mary Smith | Spouse | — | 55 | ~1885 |
Census Appearances
1920
Dubuque, Iowa
Son, age 1
Dubuque, Iowa · implied b. ~1919 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smith |
| Given Name | Laurence J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Dubuque, Iowa
Son, age 11
Dubuque, Iowa · implied b. ~1919 — 11 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Smitt |
| Given Name | Lawrence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Dubuque-County, Iowa
Son, age 21
Dubuque-County, Iowa · implied b. ~1919 — 8 household members
| Surname | Smith |
| Given Name | Lawrence |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Dodge Township |
| 1935 Residence (County) | Dubuque |
| Income (1939) | 0 |
| 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 Lawrence Smith across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Joseph Smith (~0.92 confidence) and father Joe Smith (~0.92 confidence) and mother Mary Smith (~0.92 confidence) and mother Agnes Smith (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Joseph Smith
b. ~1877
Source father
● Household
· direct · ~0.92
Father
Joe Smith
b. ~1878
Source father
● Household
· direct · ~0.92
Mother
Mary Smith
b. ~1885
Source mother
● Household
· direct · ~0.92
Mother
Agnes Smith
b. ~1888
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Lawrence Smith
Son · 1940 · age 21 · b. ~1919 · Iowa
★ You are viewing this record
Sibling
Monica Smith
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Louis Smith
Sibling · 1940 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leonard Smith
Sibling · 1940 · age 27
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Evelyn Smith
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Smith
Sibling · 1940 · age 15
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 — Dubuque-County, Iowa
Open full size
1940 US Federal Census — Dubuque-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01158-00155)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | John Wilhelm | 37 | Head | Farmer | Iowa |
| 42 | Esther Wilhelm | 31 | Wife | — | Iowa |
| 43 | Larry Wilhelm | 11 | Son | — | Iowa |
| 44 | John Jr. Wilhelm | 8 | Son | — | Iowa |
| 45 | William Jr. Ostertag | 19 | Hired hand | Farm Laborer | Iowa |
| 46 | Anna Urbick | 74 | Head | — | Iowa |
| 47 | Martin Urbick | 38 | Son | Farmer | Iowa |
| 48 | John Weisheit | 31 | Head | Farmer | Iowa |
| 49 | Adella Weisheit | 33 | Wife | — | Iowa |
| 50 | Francis Mcdike | 46 | Head | Farmer | Illinois |
| 51 | Hester Mcdike | 44 | Wife | — | Iowa |
| 52 | James J. Mcdike | 12 | Son | — | Iowa |
| 53 | Leo F. Mcdike | 10 | Son | — | Iowa |
| 54 | Harry V. Mcdike | 8 | Son | — | Iowa |
| 55 | Pearl Marie Mcdike | 5 | Daughter | — | Iowa |
| 56 | Rosaly Mcdike | 2 | Daughter | — | Iowa |
| 57 | Earl Urbain | 22 | Hired hand | Farm Laborer | Iowa |
| 58 | John Jr. Rolwes | 21 | Head | Farmer | Iowa |
| 59 | Lucinda Rolwes | 20 | Wife | — | Iowa |
| 60 | Elmer Natermeir | 22 | Hired hand | Farm Laborer | Iowa |
| 61 | Leo M. Theisen | 41 | Head | Farmer | Iowa |
| 62 | Mathilda Theisen | 38 | Wife | — | Iowa |
| 63 | Merlin Theisen | 13 | Son | — | Iowa |
| 64 | Louis Rombach | 71 | Head | Farmer | Kansas |
| 65 | Clara Rombach | 31 | Wife | — | Iowa |
| 66 | Joseph P. Smith | 63 | Head | Farmer | Iowa |
| 67 | Mary Agnes Smith | 55 | Wife | — | Iowa |
| 68 | Leonard Smith | 27 | Son | Farm Laborer | Iowa |
| 69 | Louis Smith | 23 | Son | Farm Laborer | Iowa |
| 70 | Lawrence Smith THIS PERSON | 21 | Son | — | Iowa |
| 71 | Monica Smith | 17 | Daughter | — | Iowa |
| 72 | Mary Alice Smith | 15 | Daughter | — | Iowa |
| 73 | Evelyn Smith | 13 | Daughter | — | Iowa |
| 74 | Jacob Becker | 37 | Head | Farmer | Iowa |
| 75 | Milly Becker | 30 | Wife | — | Iowa |
| 76 | Jean Ann Becker | 8 | Daughter | — | Iowa |
| 77 | Donald Becker | 7 | Son | — | Iowa |
| 78 | Shirley Mae Becker | 5 | Daughter | — | Iowa |
| 79 | Norma Jane Becker | 3 | Daughter | — | Iowa |
| 80 | Verla Sue Becker | 1 | Daughter | — | Iowa |
Pedigree Summary
Lawrence + 5 siblings
Gen 1 · 4 parents
~0.92
Max depth 4 (1900–1950 window)
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)