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Isaac Johnson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Polk-County, Iowa
Our Model Tree links this Isaac Johnson across the 1920, 1930 and 1940 US Censuses in Polk-County, Iowa (XGBoost, ~Confirmed) — first a head (b.~1860), then head of a 4-person household.
Age 80
b. ~1860
Male
Head
Born: Virginia
Widowed
1940 Census Record Details
| Census Year | 1940 |
| Location | Polk-County, Iowa |
| Surname | Johnson |
| Given Name | Isaac P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 80 |
| Marital Status | Widowed |
| Birthplace | Virginia |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Additional Details | |
| Occupation | Pension |
| Class of Worker | NP |
| Income (1939) | 400 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
| Occupation | Pension |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1860 |
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.
4 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Isaac | Age | Birth yr |
|---|---|---|---|---|
| Lelia Powell | Daughter | — | 54 | ~1886 |
| Isaac Johnson | Head | — | 80 | ~1860 |
| Isaac Johnson | Son | — | 51 | ~1889 |
| Gilbert Powell | Son | — | 20 | ~1920 |
Census Appearances
1920
Polk, Iowa
Other, age 60
Polk, Iowa · implied b. ~1860 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Father-in-law |
| Sex | M |
| Color / Race | Mulatto |
| Age | 60 |
| Marital Status | Married |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Houseman |
| Industry | Hotel |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1930
Polk, Iowa
Other, age 70
Polk, Iowa · implied b. ~1860 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac P |
| Relationship to Head | Father |
| Sex | M |
| Color / Race | Black |
| Age | 70 |
| Marital Status | Widowed |
| Birthplace | Virginia |
| Father's Birthplace | Virginia |
| Mother's Birthplace | Virginia |
| Occupation | Janitor |
| Industry | Apt. Bldg |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
1940
Polk-County, Iowa
Head, age 80
Polk-County, Iowa · implied b. ~1860 — 4 household members
| Surname | Johnson |
| Given Name | Isaac P. |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 80 |
| Marital Status | Widowed |
| Birthplace | Virginia |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Pension |
| Class of Worker | NP |
| Income (1939) | 400 |
| Highest Grade | 8 |
| 1935 Residence | Same place |
| Birth State | Virginia |
| Birth Country | United States |
| Birthplace (normalized) | virginia |
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 Isaac Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage.
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This person
Anchor record
Isaac Johnson
Head · 1940 · age 80 · b. ~1860 · 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 — 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-t0627-01195-00462)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Maud Moss | 49 | Head | Laundress | Ill. |
| 2 | Sumner M. Marion | 21 | Son | Labor | Missouri |
| 3 | Flora E. Mcclanahan | 33 | Daughter | Maid | Missouri |
| 4 | Moved To Kansas City Mcclanahan | None | — | — | — |
| 5 | — | None | — | — | — |
| 6 | Delia Mrs. Holt | 70 | Head | — | Missouri |
| 7 | Frances Mrs. Wells | 30 | Daughter | Home | Iowa |
| 8 | Luther M. Wells | 30 | Son-in-law | Trimmer | Iowa |
| 9 | Joseph Johnson | 40 | Nephew | Mech. Asst. | Okla. |
| 10 | Mary B. Glass | 64 | Head | Home Wk. | Mississippi |
| 11 | John Glass | 74 | Husband | Pension | Georgia |
| 12 | Kathryn Williams | 27 | Daughter | Sewing | Arkansas |
| 13 | John E. Williams | 14 | Son | — | Des Moines |
| 14 | Fred Stewart | 51 | Head | Car Washer | Kansas |
| 15 | Ida Stewart | 43 | Housekeeper | House Work | N. Carolina |
| 16 | Robert Stewart | 87 | Father | Pension | Kansas |
| 17 | Marcellus Long | 54 | Head | Labor | Alabama |
| 18 | Malinda Long | 52 | Wife | Home | Indiana |
| 19 | Isaac P. Johnson THIS PERSON | 80 | Head | Pension | Virginia |
| 20 | Lelia R. Powell | 54 | Daughter | Home | Iowa |
| 21 | Isaac H. Johnson | 51 | Son | Pension | Iowa |
| 22 | Gilbert P. Powell | 20 | Son | — | Iowa |
| 23 | Merle Logan | 64 | Head | U.P.R. | Missouri |
| 24 | Julia B. Logan | 56 | Wife | Home | Iowa |
| 25 | Harry Miller | 46 | Head | In Hospital | Maryland |
| 26 | Iola Miller | 33 | Wife | Home | Illinois |
| 27 | Jennie Mrs. Thompson | 50 | Head | Laundry | Texas |
| 28 | James Oliver | 28 | Son | Labor | Texas |
| 29 | Mary Tucker | 46 | Head | Seamstress | Tennessee |
| 30 | Martin R. Tucker | 18 | Son | Gas Station | Iowa |
| 31 | Gad B. Tucker | 43 | Son-in-law | Mechanic | S. Carolina |
| 32 | Helen Lewis | 26 | Head | Home | Texas |
| 33 | Frank E. Lewis | 24 | Husband | Labor | Missouri |
| 34 | Nannie M. Jamison | 25 | Lodger | Maid | Kansas |
| 35 | Sarah J. Moore | 42 | Head | Home | Iowa |
| 36 | Ralph White | 52 | Lodger | Labor | Kansas |
| 37 | Arthur W. Smart | 38 | Head | Relief Direct. | Minn. |
| 38 | Ida Brown | 47 | Head | — | Iowa |
| 39 | Alice Johnson | 24 | Daughter | — | Iowa |
| 40 | Nancy Mcgruder | 2 | Grand D. | — | 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)