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Isaac Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Sumter-County, Alabama
Our Model Tree links this Isaac Johnson across the 1920, 1930 and 1940 US Censuses in Sumter-County, Alabama (XGBoost, ~Confirmed), with identified parents Andrew & Melvina — first a son (b.~1922), then head of a 5-person household.
Age 18
b. ~1922
Male
Son
Born: Alabama
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Sumter-County, Alabama |
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Alabama |
| 1935 Residence (City) | Precinct 1 |
| 1935 Residence (County) | Sumter |
| Additional Details | |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 50 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
| Township / Ward | Precinct 1 |
| Est. Birth Year | ~1922 |
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.
5 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Isaac | Age | Birth yr |
|---|---|---|---|---|
| Neely Johnson | Daughter | — | 17 | ~1923 |
| Lina Young | Daughter | — | 27 | ~1913 |
| Francis Johnson | Head | — | 50 | ~1890 |
| John Young | Other | — | 62 | ~1878 |
| Isaac Johnson | Son | — | 18 | ~1922 |
Census Appearances
1920
Sumter, Alabama
Son, age 2
Sumter, Alabama · implied b. ~1918 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 2 |
| Marital Status | Single |
| Birthplace | Alabama |
| Father's Birthplace | Alabama |
| Mother's Birthplace | Alabama |
| Occupation | none |
| Speaks English | Yes |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
1930
Sumter, Alabama
Son, age 10
Sumter, Alabama · implied b. ~1920 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | son |
| Sex | M |
| Color / Race | Black |
| Age | 10 |
| Marital Status | Single |
| Birthplace | Alabama |
| Father's Birthplace | Alabama |
| Mother's Birthplace | Alabama |
| Can Read/Write | Yes |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
1940
Sumter-County, Alabama
Son, age 18
Sumter-County, Alabama · implied b. ~1922 — 5 household members
| Surname | Johnson |
| Given Name | Isaac |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | Black |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Alabama |
| 1935 Residence (City) | Precinct 1 |
| 1935 Residence (County) | Sumter |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 50 |
| Highest Grade | No 5 |
| 1935 Residence | Same place |
| Birth State | Alabama |
| Birth Country | United States |
| Birthplace (normalized) | alabama |
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. Identified parents: father Andrew Johnson (~0.92 confidence) and mother Melvina Johnson (~0.92 confidence) and father Francis Johnson (~0.92 confidence) and mother Francis Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Andrew Johnson
b. ~1881
Source father
● Household
· direct · ~0.92
Mother
Melvina Johnson
b. ~1885
Source mother
● Household
· direct · ~0.92
Father
Francis Johnson
b. ~1889
Source father
● Household
· direct · ~0.92
Mother
Francis Johnson
b. ~1890
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Isaac Johnson
Son · 1940 · age 18 · b. ~1922 · Alabama
★ You are viewing this record
Sibling
Neely Johnson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Lina Young
Sibling · 1940 · age 27
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 — Sumter-County, Alabama
Open full size
1940 US Federal Census — Sumter-County, Alabama
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00080-00020)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Spencer Jenkins | 42 | Head | Farming | Alabama |
| 42 | Almeta Jenkins | 42 | Wife | — | Alabama |
| 43 | Geneva Jenkins | 13 | Son | — | Alabama |
| 44 | Leona Jenkins | 11 | Daughter | — | Alabama |
| 45 | Charlie Jenkins | 10 | Son | — | Alabama |
| 46 | Telma Jenkins | 4 | Daughter | — | Mississippi |
| 47 | Nathan Mcclendon | 24 | Head | Farming | Alabama |
| 48 | Clarista Mcclendon | 20 | Wife | — | Alabama |
| 49 | Mary Mcclendon | 3 | Daughter | — | Alabama |
| 50 | Lucinda Harris | 20 | Head | Farming | Alabama |
| 51 | Robert Hardaway | 72 | Head | Farming | Alabama |
| 52 | Mary Hardaway | 66 | Wife | — | Alabama |
| 53 | Eddie Hardaway | 35 | Son | Farming | Alabama |
| 54 | Olivia Tidmore | 67 | Sister-in-law | — | Alabama |
| 55 | Francis Johnson | 50 | Head | Farming | Alabama |
| 56 | Isaac Johnson THIS PERSON | 18 | Son | — | Alabama |
| 57 | Neely Johnson | 17 | Daughter | — | Alabama |
| 58 | John Young | 62 | Son-in-law | — | Alabama |
| 59 | Lina Young | 27 | Daughter | — | Alabama |
| 60 | Charity Lee | 34 | Head | Farming | Alabama |
| 61 | Willie Lee | 17 | Son | — | Alabama |
| 62 | Alonzo Swan | 31 | Head | Farming | Alabama |
| 63 | Daisy Swan | 14 | Wife | — | Alabama |
| 64 | Mandy Brown | 50 | Head | Farming | Alabama |
| 65 | Annie Bee Brown | 20 | Daughter | — | Alabama |
| 66 | Leona Brown | 18 | Daughter | — | Alabama |
| 67 | Nelson Williams | 27 | Head | Farming | Alabama |
| 68 | Margaret Williams | 23 | Wife | — | Alabama |
| 69 | Walter Williams | 4 | Son | — | Alabama |
| 70 | Nathan Jr. Williams | 3 | Son | — | Alabama |
| 71 | Annie Lou Williams | 1 | Daughter | — | Alabama |
| 72 | Mattie Williams | 65 | Mother | — | Alabama |
| 73 | Mary Williams | 23 | Sister | — | Alabama |
| 74 | Hayward Donald | 33 | Head | Farming | Alabama |
| 75 | Jennie Donald | 30 | Wife | — | Alabama |
| 76 | Pearl Donald | 14 | Daughter | — | Alabama |
| 77 | Hayward Jr. Donald | 12 | Son | — | Alabama |
| 78 | Mary Donald | 7 | Daughter | — | Alabama |
| 79 | Joseph Donald | 5 | Son | — | Alabama |
| 80 | Prince Donald | 3 | Son | — | Alabama |
Pedigree Summary
Isaac + 2 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)