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John Clark — 1930 US Census Record
Model Tree available1930 United States Federal Census · Polk, Iowa
Our Model Tree links this John Clark across the 1920, 1930 and 1940 US Censuses in Polk, Iowa (XGBoost, ~Confirmed), with identified parents Garret & Delfa — first a head (b.~1904), then head of a 4-person household.
Age 26
b. ~1904
Male
Head
Born: Missouri
Married
1930 Census Record Details
| Census Year | 1930 |
| Location | Polk, Iowa |
| Surname | Clark |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Missouri |
| Age at First Marriage | 21 |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Additional Details | |
| Occupation | Electrician |
| Industry | Oil Burner |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 25 |
| Radio Set | R |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
| Occupation | Electrician |
| Township / Ward | Des Moines City |
| Est. Birth Year | ~1904 |
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 1930 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| John Clark | Head | — | 26 | ~1904 |
| Albert Lewis | Other | — | 24 | ~1906 |
| Jack Clark | Son | — | 3 | ~1927 |
| Doris Clark | Spouse | — | 23 | ~1907 |
Census Appearances
1920
Polk, Iowa
Son, age 16
Polk, Iowa · implied b. ~1904 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | John |
| Relationship to Head | son |
| Sex | M |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Missouri |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Indiana |
| Occupation | Laborer |
| Industry | Thresh mach co |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
1930
Polk, Iowa
Head, age 26
Polk, Iowa · implied b. ~1904 — 4 household members
| Surname | Clark |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 26 |
| Marital Status | Married |
| Birthplace | Missouri |
| Age at First Marriage | 21 |
| Father's Birthplace | Missouri |
| Mother's Birthplace | Missouri |
| Occupation | Electrician |
| Industry | Oil Burner |
| Class of Worker | W |
| Can Read/Write | Yes |
| Home Owned/Rented | R |
| Home Value / Rent | 25 |
| Radio Set | R |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
Head, age 37
Polk-County, Iowa · implied b. ~1903 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clarke |
| Given Name | John |
| Relationship to Head | Head |
| Sex | M |
| Color / Race | White |
| Age | 37 |
| Marital Status | Married |
| Birthplace | Missouri |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Stationary Engineer |
| Industry | Fuel & Heat Company |
| Class of Worker | OA |
| Hours Worked | 48 |
| Income (1939) | 2273 |
| Highest Grade | Hs 3 |
| 1935 Residence | Same place |
| Birth State | Missouri |
| Birth Country | United States |
| Birthplace (normalized) | missouri |
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 Clark across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father Garret Clark (~0.92 confidence) and mother Delfa Clark (~0.92 confidence). The pedigree spans 1 generation with 2 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Garret Clark
b. ~1879
Source father
● Household
· direct · ~0.92
Mother
Delfa Clark
b. ~1880
Source mother
● Household
· direct · ~0.92
This person
Anchor record
John Clark
Head · 1930 · age 26 · b. ~1904 · Iowa
★ You are viewing this record
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1930 US Federal Census — Polk, Iowa
Open full size
1930 US Federal Census — Polk, Iowa
Page Contents
37 people indexed on this census page (ia:1930:iowacensus00reel675:0944)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | Evelyn Green | 7 | Daughter | — | Iowa |
| 52 | Gertrude Green | 6 | Daughter | — | Iowa |
| 53 | Beatrice Green | 5 | Daughter | — | Iowa |
| 54 | Frank E. Dixon | 53 | Head | Car Repairer | Nebraska |
| 55 | Louise Ealdl | 71 | Mother-in-law | — | Iowa |
| 56 | Dora Thompson | 30 | Step-daughter | Blacksmith | Iowa |
| 57 | Ben F. Wellington | 39 | Head | Checker | Virginia |
| 58 | Anna Wellington | 44 | Wife | Elevator Girl | Iowa |
| 59 | Lucy Green | 74 | Mother-in-law | — | Virginia |
| 60 | Rose Dunne | 47 | Sister-in-law | — | Virginia |
| 61 | James J. Lee | 37 | Head | Carpenter | New York |
| 62 | Lee Lee | 73 | Mother | — | Ireland |
| 63 | Frank Gardner | 30 | Head | Laborer | New York |
| 64 | Velma Gardner | 24 | Wife | — | Iowa |
| 65 | Harry Gardner | 1 | Son | — | Iowa |
| 66 | Harvey Young | 48 | Head | Laborer | Iowa |
| 67 | Lucy Young | 47 | Wife | — | North Carolina |
| 68 | Leona Young | 15 | Daughter | — | Iowa |
| 69 | Sylvester Young | 9 | Son | — | Iowa |
| 70 | Frank Young | 29 | Son | Laborer | Arkansas |
| 71 | Hazel Young | 20 | Daughter-in-law | Laborer | Iowa |
| 72 | Emil Pearson | 37 | Head | Carpenter | Sweden |
| 73 | Charlotte Pearson | 32 | Wife | — | Iowa |
| 74 | Brinton Pearson | 13 | Son | — | Iowa |
| 75 | Mabel Pearson | 7 | Daughter | — | Iowa |
| 76 | Lois Pearson | 4 | Daughter | — | Iowa |
| 77 | Normajean Pearson | 2 | Daughter | — | Iowa |
| 78 | John Clark THIS PERSON | 26 | Head | Electrician | Missouri |
| 79 | Doris Clark | 23 | Wife | — | Iowa |
| 80 | Jack A. Clark | 3 | Son | — | Iowa |
| 81 | Albert Lewis | 24 | Boarder | Cabinet Maker | Iowa |
| 82 | Jesse A. Tawney | 44 | Head | Brickmason | Nebraska |
| 83 | Floy Tawney | 43 | Wife | — | Iowa |
| 84 | Frankie Stacey | 14 | Niece | — | Iowa |
| 85 | Margaret Stacey | 12 | Niece | — | Iowa |
| 86 | William Stacey | 11 | Nephew | — | Iowa |
| 87 | John T. Wright | 4 | Son | — | Iowa |
Related Census Records
Pedigree Summary
John
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)