HB
Harold Brown — 1940 US Census Record
Model Tree available1940 United States Federal Census · Mercer-County, Illinois
Our Model Tree links this Harold Brown across the 1920, 1930 and 1940 US Censuses in Mercer-County, Illinois (XGBoost, ~Confirmed), with identified parents Lloyd & Boyd — first a son (b.~1919), then head of a 6-person household.
Age 21
b. ~1919
Male
Son
Born: Illinois
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Mercer-County, Illinois |
| Surname | Brown |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Mercer |
| Additional Details | |
| Occupation | Farm Hand |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
| Occupation | Farm Hand |
| Township / Ward | Mercer |
| 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.
6 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Harold | Age | Birth yr |
|---|---|---|---|---|
| Addie Brown | Daughter | — | 9 | ~1931 |
| Lena Brown | Daughter | — | 18 | ~1922 |
| Boyd Brown | Head | — | 53 | ~1887 |
| Harold Brown | Son | — | 21 | ~1919 |
| Richard Brown | Son | — | 13 | ~1927 |
| Mable Brown | Spouse | — | 46 | ~1894 |
Census Appearances
1920
Mercer, Illinois
Son, age 1
Mercer, Illinois · implied b. ~1919 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Harold B |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1930
Mercer, Illinois
Son, age 11
Mercer, Illinois · implied b. ~1919 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Brown |
| Given Name | Harold Boyd |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Illinois |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Illinois |
| Can Read/Write | Yes |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
1940
Mercer-County, Illinois
Son, age 21
Mercer-County, Illinois · implied b. ~1919 — 6 household members
| Surname | Brown |
| Given Name | Harold |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Illinois |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Mercer |
| Occupation | Farm Hand |
| Industry | Farm |
| Class of Worker | NP |
| Hours Worked | 80 |
| Income (1939) | 0 |
| Highest Grade | Hs 4 |
| 1935 Residence | Illinois |
| Birth State | Illinois |
| Birth Country | United States |
| Birthplace (normalized) | illinois |
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 Harold Brown across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Lloyd Brown (~0.92 confidence) and father Boyd Brown (~0.92 confidence) and father Boyd Brown (~0.92 confidence) and mother Mable Brown (~0.92 confidence) and mother Mable Brown (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Lloyd Brown
b. ~1886
Source father
● Household
· direct · ~0.92
Father
Boyd Brown
b. ~1887
Source father
● Household
· direct · ~0.92
Father
Boyd Brown
b. ~1887
Source father
● Household
· direct · ~0.92
Mother
Mable Brown
b. ~1894
Source mother
● Household
· direct · ~0.92
Mother
Mable Brown
b. ~1895
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Harold Brown
Son · 1940 · age 21 · b. ~1919 · Illinois
★ You are viewing this record
Sibling
Lena Brown
Sibling · 1940 · age 18
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Richard Brown
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Addie Brown
Sibling · 1940 · age 9
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 — Mercer-County, Illinois
Open full size
1940 US Federal Census — Mercer-County, Illinois
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00858-00246)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Denton W. Eastman | 46 | Head | Veterinarian | Illinois |
| 42 | Tressa Eastman | 42 | Wife | — | Pennsylvania |
| 43 | Emmadora Eastman | 15 | Daughter | — | Illinois |
| 44 | Mary Eastman | 13 | Daughter | — | Illinois |
| 45 | Jack Daulton | 49 | Head | Cook, Man | Missouri |
| 46 | Olive O. Daulton | 35 | Wife | Cook | Illinois |
| 47 | Boyd Brown | 53 | Head | Farming | Illinois |
| 48 | Mable Brown | 46 | Wife | — | Illinois |
| 49 | Harold Brown THIS PERSON | 21 | Son | Farm Hand | Illinois |
| 50 | Lena Brown | 18 | Daughter | Nurse Training | Illinois |
| 51 | Richard Brown | 13 | Son | — | Illinois |
| 52 | Addie May Brown | 9 | Daughter | — | Illinois |
| 53 | Hiram Forkman | 48 | Head | Cirkelot Man | Illinois |
| 54 | Julia Forkman | 46 | Wife | — | Illinois |
| 55 | Betty Forkman | 20 | Daughter | Bookkeeper | Illinois |
| 56 | Ed Ben Green | 67 | Head | Trailer | Illinois |
| 57 | Martha Green | 68 | Wife | — | Illinois |
| 58 | James A. Johnson | 46 | Head | Farm Hand | Kentucky |
| 59 | Della Johnson | 43 | Wife | — | Missouri |
| 60 | Melvin Johnson | 12 | Son | — | Illinois |
| 61 | Virgil Peterson | 36 | Head | Farming | Illinois |
| 62 | Margaret Peterson | 39 | Wife | — | Illinois |
| 63 | Helen Peterson | 10 | Daughter | — | Illinois |
| 64 | Ray Davis | 37 | Head | Labor | Illinois |
| 65 | Carl Bergstran | 41 | Roomer | Labor | Illinois |
| 66 | John Ogden | 55 | Roomer | Labor | Iowa |
| 67 | Carl D. Waddell | 20 | Roomer | Labor | Iowa |
| 68 | Ward Hinson | 27 | Roomer | Labor | Iowa |
| 69 | Will Tomas | 56 | Head | Farming | Kentucky |
| 70 | Annaree Tomas | 40 | Wife | — | Kentucky |
| 71 | Herbert Fisher | 32 | Head | Farming | Illinois |
| 72 | Margaret Fisher | 28 | Wife | — | Illinois |
| 73 | Frank H. Wilda | 60 | Head | Farming | Illinois |
| 74 | Caroline Wilda | 60 | Wife | — | Illinois |
| 75 | Jonelle Wilda | 24 | Son | Farming | Illinois |
| 76 | George Fisher | 65 | Head | Farming | Illinois |
| 77 | Katherine Fisher | 62 | Wife | — | Illinois |
| 78 | Lenard Fisher | 30 | Son | Farming | Illinois |
| 79 | Clara Fisher | 22 | Daughter | Clerk | Illinois |
| 80 | Rachael Fisher | 24 | Daughter | Student Nurse | Illinois |
Pedigree Summary
Harold + 3 siblings
Gen 1 · 5 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)