JC
John Carroll — 1930 US Census Record
Model Tree available1930 United States Federal Census · Denver, Colorado
Our Model Tree links this John Carroll across the 1920, 1930 and 1940 US Censuses in Denver, Colorado (XGBoost, ~Confirmed), with identified parents Gerald & Margaret — first a son (b.~1910), then head of a 5-person household.
Age 20
b. ~1910
Male
Son
Born: Colorado
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Denver, Colorado |
| Surname | Carroll |
| Given Name | John J. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Additional Details | |
| Occupation | apprentice |
| Industry | Bakery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
| Occupation | Apprentice |
| Township / Ward | Denver City |
| Est. Birth Year | ~1910 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Geraldine Carroll | Daughter | — | 18 | ~1912 |
| Gerald Carroll | Head | — | 45 | ~1885 |
| Nick Podkonjak | Other | — | 44 | ~1886 |
| John Carroll | Son | — | 20 | ~1910 |
| Margaret Carroll | Spouse | — | 44 | ~1886 |
Census Appearances
1920
Denver, Colorado
Other, age 8
Denver, Colorado · implied b. ~1912 — 7 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carroll |
| Given Name | John J |
| Relationship to Head | Grandson |
| Sex | M |
| Color / Race | White |
| Age | 8 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Occupation | none |
| Speaks English | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1930
Denver, Colorado
Son, age 20
Denver, Colorado · implied b. ~1910 — 5 household members
| Surname | Carroll |
| Given Name | John J. |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 20 |
| Marital Status | Single |
| Birthplace | Colorado |
| Father's Birthplace | Colorado |
| Mother's Birthplace | Colorado |
| Occupation | apprentice |
| Industry | Bakery |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
1940
Denver-County, Colorado
Head, age 30
Denver-County, Colorado · implied b. ~1910 — 2 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Carrol |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 30 |
| Marital Status | Married |
| Birthplace | Colorado |
| 1935 Residence (City) | Denver |
| 1935 Residence (County) | Denver |
| Occupation | Baker |
| Industry | Wholesale Bakery |
| Class of Worker | PW |
| Hours Worked | 0 |
| Income (1939) | 1500 |
| Highest Grade | No 8 |
| 1935 Residence | Same house |
| Birth State | Colorado |
| Birth Country | United States |
| Birthplace (normalized) | colorado |
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 Carroll across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Gerald Carroll (~0.92 confidence) and mother Margaret Carroll (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Gerald Carroll
b. ~1885
Source father
● Household
· direct · ~0.92
Mother
Margaret Carroll
b. ~1886
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Carroll
Son · 1930 · age 20 · b. ~1910 · Colorado
★ You are viewing this record
Sibling
Geraldine Carroll
Sibling · 1930 · age 18
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
1930 US Federal Census — Denver, Colorado
Open full size
1930 US Federal Census — Denver, Colorado
Page Contents
48 people indexed on this census page (ia:1930:15thcensus240unit:0459)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Robert Leff | 7 | son | None | Colorado |
| 2 | Melvin Irwin | 24 | stepson | Carpenter | Missouri |
| 3 | Earl Irwin | 20 | stepson | Carpenter | Missouri |
| 4 | John Irwin | 18 | stepson | Carpenter | Missouri |
| 5 | Charles Irwin | 16 | stepson | Carpenter | Missouri |
| 6 | Hazel Irwin | 10 | stepdaughter | None | Missouri |
| 7 | Thomas Hundran | 33 | Head | Laborer | Colorado |
| 8 | Esther Hundran | 27 | wife | Wrapper | Wisconsin |
| 9 | Joseph L. Hundran | 4 | son | None | Wyoming |
| 10 | George Thiel | 26 | Head | Packer | Colorado |
| 11 | Mary A. Thiel | 26 | wife | None | Illinois |
| 12 | Robert G. Thiel | 1 | son | None | Colorado |
| 13 | Clayton H. Pech | 62 | Head | Boiler Maker | Ohio |
| 14 | John F. Anderson | 65 | Head | Finisher | Sweden |
| 15 | Emma L. Anderson | 65 | wife | None | Sweden |
| 16 | Gerald Carroll | 45 | Head | Machinist | Colorado |
| 17 | Margaret Carroll | 44 | wife | None | Colorado |
| 18 | John J. Carroll THIS PERSON | 20 | son | Apprentice | Colorado |
| 19 | Geraldine Carroll | 18 | daughter | Operator | Colorado |
| 20 | Nick Podkonjak | 44 | boarder | Laborer | Yugoslavia |
| 21 | Jacob Schroth | 68 | Head | Caretaker | Germany |
| 22 | Frank Olson | 62 | Head | Watchman | Sweden |
| 23 | Emma Olson | 58 | wife | None | Sweden |
| 24 | Susan S. Thomas | 84 | Head | None | England |
| 25 | Martin Van Loon | 25 | Head | Laborer | Colorado |
| 26 | Velma Van Loon | 19 | wife | None | Colorado |
| 27 | Betty J. Van Loon | 2 | daughter | None | Colorado |
| 28 | Joseph Johnston | 36 | Head | Baker | Colorado |
| 29 | Alice Johnston | 14 | daughter | None | Colorado |
| 30 | Mary Johnston | 9 | daughter | None | Colorado |
| 31 | Frank Callaghan | 49 | Head | Blacksmith | Iowa |
| 32 | Theresia Callaghan | 53 | wife | None | Missouri |
| 33 | Frank Callaghan | 18 | son | Laborer | Colorado |
| 34 | Betty L. Callaghan | 12 | daughter | None | Colorado |
| 35 | Henry William Callaghan | 78 | father | None | Indiana |
| 36 | Alexander Sweet | 25 | Head | Dish Washer | Russia |
| 37 | Christiana Sweet | 18 | wife | None | Colorado |
| 38 | Alexander Jr. Sweet | 6 | son | None | Colorado |
| 39 | Johnnie Sweet | 4 | son | None | Colorado |
| 40 | Helen Sweet | 3 | daughter | None | Colorado |
| 41 | Lawrence Sweet | 2 | son | None | Colorado |
| 42 | Walter P. Donald | 50 | Head | Machinist | England |
| 43 | Jane C. Donald | 57 | wife | None | Illinois |
| 44 | Hannah Donald | 84 | Aunt | None | England |
| 45 | George Doherty | 57 | Head | Huckster | Colorado |
| 46 | Atwood Peepgrass | 63 | Head | None | Germany |
| 47 | Katherine Peepgrass | 68 | wife | None | Germany |
| 48 | George B. Peepgrass | 32 | son | Clerk | Colorado |
Pedigree Summary
John + 1 sibling
Gen 1 · 2 parents
~0.92
Max depth 4 (1900–1950 window)
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1930 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)