JF
John Fitzgerald — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Boone-County, Iowa
Our Model Tree links this John Fitzgerald across the 1930 and 1940 US Censuses in Boone-County, Iowa (XGBoost, ~Confirmed) — first a son (b.~1922), then head of a 10-person household.
Age 18
b. ~1922
Male
Son
Born: Iowa
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Boone-County, Iowa |
| Surname | Fitzgerald |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Boone |
| Additional Details | |
| Highest Grade | H 2 |
| 1935 Residence | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Township / Ward | Boone |
| 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.
10 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Theresa Fitzgerald | Daughter | — | 10 | ~1930 |
| Yvonne Fitzgerald | Daughter | — | 6 | ~1934 |
| Mary Fitzgerald | Daughter | — | 12 | ~1928 |
| Joan Fitzgerald | Daughter | — | 2 | ~1938 |
| James Fitzgerald | Head | — | 44 | ~1896 |
| Leo Fitzgerald | Son | — | 10 | ~1930 |
| Donald Fitzgerald | Son | — | 14 | ~1926 |
| John Fitzgerald | Son | — | 18 | ~1922 |
| James Fitzgerald | Son | — | 16 | ~1924 |
| Irene Fitzgerald | Spouse | — | 40 | ~1900 |
Census Appearances
1930
Boone, Iowa
Other, age 8
Boone, Iowa · implied b. ~1922 — 9 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Fitzgerald |
| Given Name | John C |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Iowa |
| Age at First Marriage | 8 |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Iowa |
| Can Read/Write | Yes |
| Veteran | No |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Boone-County, Iowa
Son, age 18
Boone-County, Iowa · implied b. ~1922 — 10 household members
| Surname | Fitzgerald |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 18 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | R |
| 1935 Residence (County) | Boone |
| Highest Grade | H 2 |
| 1935 Residence | Iowa |
| 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 John Fitzgerald across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Fitzgerald
Son · 1940 · age 18 · b. ~1922 · Iowa
★ You are viewing this record
Sibling
Yvonne Fitzgerald
Sibling · 1940 · age 6
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Joan Fitzgerald
Sibling · 1940 · age 2
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Theresa Fitzgerald
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Mary Fitzgerald
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Donald Fitzgerald
Sibling · 1940 · age 14
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Leo Fitzgerald
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
James Fitzgerald
Sibling · 1940 · age 16
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-t0627-01141-00148)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Pearl O. Kunes | 38 | Head | Printer | Iowa |
| 42 | Irene D. Kunes | 36 | Wife | — | Iowa |
| 43 | James V. Kunes | 10 | Son | — | Iowa |
| 44 | Kenneth Kunes | 7 | Son | — | Iowa |
| 45 | Emanuel A. Holquist | 40 | Head | Electrician | Sweden |
| 46 | Dorothy A. D. Holquist | 34 | Wife | — | Massachusetts |
| 47 | Lester Holquist | 21 | Son | Nut Worker | Minnesota |
| 48 | Lorraine Holquist | 20 | Daughter | Book Keeper | Minnesota |
| 49 | Daniel Holquist | 12 | Son | — | Illinois |
| 50 | James P. Fitzgerald | 44 | Head | Mechanic | Illinois |
| 51 | Irene Fitzgerald | 40 | Wife | — | Iowa |
| 52 | John Fitzgerald THIS PERSON | 18 | Son | — | Iowa |
| 53 | James Fitzgerald | 16 | Son | — | Iowa |
| 54 | Donald Fitzgerald | 14 | Son | — | Iowa |
| 55 | Mary Lee Fitzgerald | 12 | Daughter | — | Iowa |
| 56 | Theresa Fitzgerald | 10 | Daughter | — | Iowa |
| 57 | Leo Fitzgerald | 10 | Son | — | Iowa |
| 58 | Yvonne Fitzgerald | 6 | Daughter | — | Iowa |
| 59 | Joan Fitzgerald | 2 | Daughter | — | Iowa |
| 60 | Ralph Merkel | 39 | Head | Laborer | Iowa |
| 61 | Florence D. Merkel | 33 | Wife | — | Iowa |
| 62 | Deloris Merkel | 12 | Daughter | — | Iowa |
| 63 | Patricia Merkel | 3 | Daughter | — | Iowa |
| 64 | Karen Merkel | 0 | Daughter | — | Iowa |
| 65 | Robert Mclehee | 36 | Head | Laborer | Iowa |
| 66 | Lydia D. Mclehee | 42 | Wife | — | Iowa |
| 67 | Robert D. Mclehee | 12 | Son | — | Iowa |
| 68 | Mary Alexander | 57 | Head | — | Iowa |
| 69 | Emma Mary Alexander | 68 | Sister | Sales Lady | Wisconsin |
| 70 | Wayne Shafer | 34 | Head | Trucker | Iowa |
| 71 | Clara D. Shafer | 30 | Wife | — | Iowa |
| 72 | Elaine Shafer | 7 | Daughter | — | Iowa |
| 73 | Amanda X Hizel | 63 | Head | — | Iowa |
| 74 | Evelyn D. Heitkamp | 29 | Head | — | Iowa |
| 75 | Virginia D. Heitkamp | 18 | Daughter | — | Iowa |
| 76 | Kathryn Heitkamp | 15 | Daughter | — | Iowa |
| 77 | Edward Ivis | 36 | Head | Delivery Man | Iowa |
| 78 | Elizabeth D. Ivis | 33 | Wife | — | Iowa |
| 79 | Donald Ivis | 3 | Son | — | Iowa |
| 80 | Harrold Jay Penderis | 79 | Head | — | 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)