MC
Mary Clark — 1930 US Census Record
Model Tree available1930 United States Federal Census · Lucas, Iowa
Our Model Tree links this Mary Clark across the 1910, 1920 and 1930 US Censuses in Lucas, Iowa (XGBoost, ~Confirmed), with identified parents Isaac & Jesse — first a daughter (b.~1909), then head of a 4-person household.
Age 21
b. ~1909
Female
Daughter
Born: Iowa
Single
1930 Census Record Details
| Census Year | 1930 |
| Location | Lucas, Iowa |
| Surname | Clark |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Additional Details | |
| Occupation | Nurse |
| Industry | Gen. Hospital |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Nurse |
| Township / Ward | Jackson Twsp |
| Est. Birth Year | ~1909 |
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 Mary | Age | Birth yr |
|---|---|---|---|---|
| Edith Clark | Daughter | — | 23 | ~1907 |
| Mary Clark | Daughter | — | 21 | ~1909 |
| Violet Clark | Daughter | — | 8 | ~1922 |
| Isaac Clark | Head | — | 50 | ~1880 |
Census Appearances
1910
Lucas, Iowa
Daughter, age 1
Lucas, Iowa · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 1 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1920
Lucas, Iowa
Daughter, age 11
Lucas, Iowa · implied b. ~1909 — 4 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Clark |
| Given Name | Mary A |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Lucas, Iowa
Daughter, age 21
Lucas, Iowa · implied b. ~1909 — 4 household members
| Surname | Clark |
| Given Name | Mary A |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Iowa |
| Mother's Birthplace | Iowa |
| Occupation | Nurse |
| Industry | Gen. Hospital |
| Class of Worker | W |
| Can Read/Write | Yes |
| 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 Mary Clark across 3 US Census years (1910, 1920 and 1930) in Lucas, Iowa, using XGBoost record linkage. Identified parents: father Isaac Clark (~0.92 confidence) and father Jesse Clark (~0.92 confidence) and father Isaac Clark (~0.92 confidence) and mother Mary Clark (~0.92 confidence) and mother Mary Clark (~0.92 confidence). The pedigree spans 1 generation with 5 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
Isaac Clark
b. ~1880
Source father
● Household
· direct · ~0.92
Father
Jesse Clark
b. ~1860
Source father
● Household
· direct · ~0.92
Father
Isaac Clark
b. ~1880
Source father
● Household
· direct · ~0.92
Mother
Mary Clark
b. ~1866
Source mother
● Household
· direct · ~0.92
Mother
Mary Clark
b. ~1884
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Mary Clark
Daughter · 1930 · age 21 · b. ~1909 · Iowa
★ You are viewing this record
Sibling
Edith Clark
Sibling · 1930 · age 23
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Violet Clark
Sibling · 1930 · age 8
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 — Lucas, Iowa
Open full size
1930 US Federal Census — Lucas, Iowa
Page Contents
50 people indexed on this census page (ia:1930:iowacensus00reel666:0446)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 1 | Levi Herndon | 37 | Head | Farmer | Iowa |
| 2 | Lizzie H Herndon | 35 | Wife | — | Iowa |
| 3 | Margaret P Herndon | 13 | Daughter | — | Iowa |
| 4 | Laura M Herndon | 11 | Daughter | — | Iowa |
| 5 | Earnest E Herndon | 9 | Son | — | Iowa |
| 6 | Anna J Heaton | 54 | Head | Farmer | Iowa |
| 7 | Walter E Heaton | 20 | Son | Teacher | Iowa |
| 8 | Howard G Heaton | 16 | Son | Laborer | Iowa |
| 9 | Herman L Heaton | 16 | Son | Laborer | Iowa |
| 10 | Ephraim A White | 72 | Head | — | Missouri |
| 11 | Nancy E Murphy | 40 | Stepdaughter | — | Iowa |
| 12 | Henry J Skinner | 44 | Head | Farmer | Iowa |
| 13 | Myrtle L Skinner | 44 | Wife | — | Illinois |
| 14 | Lula M Skinner | 20 | Daughter | Teacher | Iowa |
| 15 | Wendel W Skinner | 18 | Son | Laborer | Iowa |
| 16 | Maurice D Skinner | 10 | Son | — | Iowa |
| 17 | Doris E Skinner | 8 | Daughter | — | Iowa |
| 18 | Audrey L Skinner | 4 | Daughter | — | Iowa |
| 19 | Patrick S Fitzpatrick | 47 | Head | Farmer | Iowa |
| 20 | Nellie M Fitzpatrick | 43 | Wife | — | Iowa |
| 21 | Lois M Fitzpatrick | 6 | Daughter | — | Iowa |
| 22 | Vera M Fitzpatrick | 3 | Daughter | — | Iowa |
| 23 | Harold N Fitzpatrick | 0 | Son | — | Iowa |
| 24 | Orville J Waller | 39 | Head | Farmer | Iowa |
| 25 | Nellie M Waller | 36 | Wife | — | Iowa |
| 26 | Wayne P Waller | 17 | Son | — | Iowa |
| 27 | Arthur L Wilcox | 48 | Head | Farmer | Iowa |
| 28 | Sarah J Wilcox | 83 | Mother | — | Indiana |
| 29 | Roy D Cochran | 46 | Head | Farmer | Iowa |
| 30 | Lucinda E Cochran | 37 | Wife | — | Iowa |
| 31 | Archie J Cochran | 12 | Son | — | Iowa |
| 32 | Ross L Cochran | 4 | Son | — | Iowa |
| 33 | Clara Cochran | 70 | Mother | — | Iowa |
| 34 | Van U Hood | 62 | Head | — | Iowa |
| 35 | Richard B Rogers | 71 | Head | Farmer | Illinois |
| 36 | Delia R Rogers | 69 | Wife | — | Iowa |
| 37 | Isaac M Clark | 50 | Head | Farmer | Iowa |
| 38 | Edith E Clark | 23 | Daughter | Teacher | Iowa |
| 39 | Mary A Clark THIS PERSON | 21 | Daughter | Nurse | Iowa |
| 40 | Violet D Clark | 8 | Daughter | — | Iowa |
| 41 | Claude M Fierce | 51 | Head | Farmer | Iowa |
| 42 | Catharine L Fierce | 44 | Wife | — | Iowa |
| 43 | Harold R Fierce | 20 | Son | — | Iowa |
| 44 | Lucille H Fierce | 18 | Daughter | — | Iowa |
| 45 | Ernest H Fierce | 16 | Son | — | Iowa |
| 46 | Wilda L Fierce | 14 | Daughter | — | Iowa |
| 47 | Mabel V Fierce | 12 | Daughter | — | Iowa |
| 48 | Amos K Quinn | 54 | Head | Farmer | Iowa |
| 49 | Lula E Quinn | 46 | Wife | — | Iowa |
| 50 | John L Quinn | 23 | Son | Laborer | Iowa |
Pedigree Summary
Mary + 2 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 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)