MJ
Marvin Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Marvin Johnson across the 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1927), then head of a 10-person household.
Age 13
b. ~1927
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Johnson |
| Given Name | Marvin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Industry | 0 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1927 |
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 Marvin | Age | Birth yr |
|---|---|---|---|---|
| Doris Johnson | Daughter | — | 9 | ~1931 |
| Marvin Johnson | Son | — | 13 | ~1927 |
| Nancy Johnson | Daughter | — | 1 | ~1939 |
| Arthur Johnson | Head | — | 42 | ~1898 |
| Doris Johnson | Daughter | — | 18 | ~1922 |
| Georgia Johnson | Spouse | — | 38 | ~1902 |
| Winifred Johnson | Daughter | — | 11 | ~1929 |
| Robert Johnson | Son | — | 4 | ~1936 |
| Osborne Johnson | Son | — | 16 | ~1924 |
| Bruce Johnson | Son | — | 7 | ~1933 |
Census Appearances
1930
Polk, Iowa
Son, age 2
Polk, Iowa · implied b. ~1928 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Marvin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Son, age 13
Polk-County, Iowa · implied b. ~1927 — 10 household members
| Surname | Johnson |
| Given Name | Marvin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Industry | 0 |
| Highest Grade | 8 |
| 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 Marvin Johnson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Marvin Johnson
Son · 1940 · age 13 · b. ~1927 · Iowa
★ You are viewing this record
Sibling
Doris Johnson
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Doris Johnson
Sibling · 1940 · age 9
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Bruce Johnson
Sibling · 1940 · age 7
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Winifred Johnson
Sibling · 1940 · age 11
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Osborne Johnson
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Robert Johnson
Sibling · 1940 · age 4
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Nancy Johnson
Sibling · 1940 · age 1
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 — Polk-County, Iowa
Open full size
1940 US Federal Census — Polk-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01197-00165)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Arthur X Johnson | 42 | Head | Fireman | Iowa |
| 2 | Georgia Johnson | 38 | Wife | — | Iowa |
| 3 | Doris Johnson | 18 | Daughter | — | Iowa |
| 4 | Osborne Johnson | 16 | Son | — | Iowa |
| 5 | Marvin Johnson THIS PERSON | 13 | Son | — | Iowa |
| 6 | Winifred Johnson | 11 | Daughter | — | Iowa |
| 7 | Doris Johnson | 9 | Daughter | — | Iowa |
| 8 | Bruce Johnson | 7 | Son | — | Iowa |
| 9 | Robert Johnson | 4 | Son | — | Iowa |
| 10 | Nancy Johnson | 1 | Daughter | — | Iowa |
| 11 | Margaret Joyce | 54 | Head | Bindery | England |
| 12 | James Joyce | 60 | Brother | Miner | England |
| 13 | Thomas Joyce | 44 | Brother | Steamfitter | Iowa |
| 14 | Elston Hardenbrook | 28 | Head | Salesman | Iowa |
| 15 | Naoma Hardenbrook | 27 | Wife | — | Iowa |
| 16 | Margaret Hardenbrook | 7 | Daughter | — | Iowa |
| 17 | Victor Jr Hardenbrook | 5 | Son | — | Iowa |
| 18 | Carol Lee Hardenbrook | 3 | Daughter | — | Iowa |
| 19 | Ralph Fleming | 28 | Head | Truck Driver | Indiana |
| 20 | Addie Fleming | 23 | Wife | — | Iowa |
| 21 | Wanda Fleming | 3 | Daughter | — | Iowa |
| 22 | Charles Burnett | 28 | Head | Express Agent | Missouri |
| 23 | Mary Burnett | 28 | Wife | Janitress | Missouri |
| 24 | Kenneth Mcdougal | 36 | Head | Truck Driver | Iowa |
| 25 | Marie Mcdougal | 50 | Wife | — | Iowa |
| 26 | John T Sr Mcdougal | 78 | Father | — | Germany |
| 27 | Guy Morris | 47 | Head | Miner | Iowa |
| 28 | Lillie Morris | 47 | Wife | — | Iowa |
| 29 | Richard Morris | 23 | Son | Miner | Iowa |
| 30 | Della Morris | 22 | Daughter | Maid | Iowa |
| 31 | Aurora Morris | 21 | Daughter | Ironing | Iowa |
| 32 | Martha Morris | 19 | Daughter | Day Work | Iowa |
| 33 | Lucille Morris | 16 | Daughter | — | Iowa |
| 34 | Gladys Morris | 13 | Daughter | — | Iowa |
| 35 | Billy Morris | 3 | Son | — | Iowa |
| 36 | Gerald Baldwin | 35 | Head | Taxidriver | Iowa |
| 37 | Agnes Baldwin | 40 | Wife | — | Iowa |
| 38 | Jack Baldwin | 15 | Son | — | Iowa |
| 39 | Glennyce Baldwin | 14 | Daughter | — | Iowa |
| 40 | Gerald Baldwin | 11 | Son | — | 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)