MJ
Melvin Johnson — 1940 US Census Record
Model Tree available1940 United States Federal Census · Boone-County, Iowa
Our Model Tree links this Melvin Johnson across the 1920, 1930 and 1940 US Censuses in Boone-County, Iowa (XGBoost, ~Confirmed), with identified parents Ray & Roy — first a son (b.~1917), then head of a 4-person household.
Age 23
b. ~1917
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Boone-County, Iowa |
| Surname | Johnson |
| Given Name | Melvin J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Boone City |
| 1935 Residence (County) | Boone |
| Additional Details | |
| Occupation | Machinist Apprentice |
| Industry | Steam Railway |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 750 |
| Highest Grade | H 4 |
| 1935 Residence | Same place |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Machinist Apprentice |
| Township / Ward | Boone City |
| Est. Birth Year | ~1917 |
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 Melvin | Age | Birth yr |
|---|---|---|---|---|
| Ray Johnson | Head | — | 50 | ~1890 |
| Richard Johnson | Son | — | 2 | ~1938 |
| Melvin Johnson | Son | — | 23 | ~1917 |
| Ruth Johnson | Spouse | — | 40 | ~1900 |
Census Appearances
1920
Boone, Iowa
Son, age 3
Boone, Iowa · implied b. ~1917 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Melvin |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 3 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Boone, Iowa
Son, age 13
Boone, Iowa · implied b. ~1917 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Johnson |
| Given Name | Melvin, L., Jr. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 13 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Indiana |
| Mother's Birthplace | Iowa |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Boone-County, Iowa
Son, age 23
Boone-County, Iowa · implied b. ~1917 — 4 household members
| Surname | Johnson |
| Given Name | Melvin J. |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 23 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Boone City |
| 1935 Residence (County) | Boone |
| Occupation | Machinist Apprentice |
| Industry | Steam Railway |
| Class of Worker | PW |
| Hours Worked | 40 |
| Income (1939) | 750 |
| 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 Melvin Johnson across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Ray Johnson (~0.92 confidence) and father Roy Johnson (~0.92 confidence) and mother Ruth Johnson (~0.92 confidence) and mother Ruth Johnson (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Ray Johnson
b. ~1890
Source father
● Household
· direct · ~0.92
Father
Roy Johnson
b. ~1890
Source father
● Household
· direct · ~0.92
Mother
Ruth Johnson
b. ~1900
Source mother
● Household
· direct · ~0.92
Mother
Ruth Johnson
b. ~1900
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Melvin Johnson
Son · 1940 · age 23 · b. ~1917 · Iowa
★ You are viewing this record
Sibling
Richard Johnson
Sibling · 1940 · age 2
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 — Boone-County, Iowa
Open full size
1940 US Federal Census — Boone-County, Iowa
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-01141-00268)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Gilbert P. Ziner | 55 | Head | Car Inspector | Iowa |
| 42 | Lena Ziner | 53 | Wife | — | Iowa |
| 43 | Thomas E. Book | 25 | Son | — | Iowa |
| 44 | Allen W. Hallan | 42 | Head | Blacksmith Helper | Iowa |
| 45 | Bessie Hallan | 36 | Wife | — | Iowa |
| 46 | Alice Mae Hallan | 16 | Daughter | — | Iowa |
| 47 | John A. Hallan | 14 | Son | — | Iowa |
| 48 | Roseanna M. Hallan | 12 | Daughter | — | Iowa |
| 49 | William R. Hallan | 10 | Son | — | Iowa |
| 50 | Betty L. Hallan | 7 | Daughter | — | Iowa |
| 51 | Ana B. Belden | 60 | Head | Teacher | Iowa |
| 52 | Ida Milledg|Milledge | 39 | Head | Proprietor | Iowa |
| 53 | Frances E. Milledg|Milledge | 33 | Wife | — | Iowa |
| 54 | Marilyn E. Milledg|Milledge | 2 | Daughter | — | Iowa |
| 55 | J. Taylor Stephenson | 76 | Father in law | — | Illinois |
| 56 | Ray E. Johnson | 50 | Head | Blacksmith | Indiana |
| 57 | Ruth A. Johnson | 40 | Wife | — | Iowa |
| 58 | Melvin J. Johnson THIS PERSON | 23 | Son | Machinist Apprentice | Iowa |
| 59 | Richard G. Johnson | 2 | Son | — | Iowa |
| 60 | Edwin S. Lainson | 51 | Head | Proprietor | Iowa |
| 61 | Mattie D. Lainson | 49 | Wife | — | Iowa |
| 62 | Charles H. Lainson | 22 | Son | Partner | Illinois |
| 63 | Eleanor B. Lainson | 20 | Daughter | — | Iowa |
| 64 | Thomas E. Lainson | 17 | Son | — | Iowa |
| 65 | Agnes Roberts | 69 | Head | — | Ohio |
| 66 | Vesta Roberts | 36 | Daughter | Office Work | Iowa |
| 67 | Frank S. Knox | 64 | Head | — | Illinois |
| 68 | Margaret L. Knox | 63 | Wife | — | Illinois |
| 69 | Eleanore L. Knox | 17 | Granddaughter | Office Work | Iowa |
| 70 | Carl Amand | 40 | Head | Bridge Foreman | Iowa |
| 71 | Bessie Amand | 35 | Wife | — | Wisconsin |
| 72 | Douglas Amand | 13 | Son | — | Iowa |
| 73 | Thomas Karros | 45 | Head | Car Inspector | Greece |
| 74 | Raymond Karros | 10 | Son | — | Iowa |
| 75 | Richard Karros | 3 | Son | — | Iowa |
| 76 | Virgil Booth | 28 | Head | Truck Driver | Iowa |
| 77 | Grace Booth | 28 | Wife | — | Iowa |
| 78 | Charles Loria | 68 | Head | — | Italy |
| 79 | Carmela Loria | 63 | Wife | — | Italy |
| 80 | Sam D. Loria | 37 | Son | Laborer | Italy |
Pedigree Summary
Melvin + 1 sibling
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)