MG
Margaret Griffin — 1930 US Census Record
Model Tree available1930 United States Federal Census · Polk, Iowa
Our Model Tree links this Margaret Griffin across the 1920, 1930 and 1940 US Censuses in Polk, Iowa (XGBoost, ~Confirmed), with identified parents D & Harry — 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 | Polk, Iowa |
| Surname | Griffin |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Missouri |
| Additional Details | |
| Occupation | Telephone Operator |
| Industry | A. T. & T. Co. Main Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
| Occupation | Telephone Operator |
| Township / Ward | Valley Junction City |
| 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 Margaret | Age | Birth yr |
|---|---|---|---|---|
| Harry Griffin | Head | — | 47 | ~1883 |
| Mary Griffin | Other | — | 47 | ~1883 |
| Margaret Griffin | Daughter | — | 21 | ~1909 |
| Bernice Griffin | Daughter | — | 13 | ~1917 |
Census Appearances
1920
Polk, Iowa
Daughter, age 11
Polk, Iowa · implied b. ~1909 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffin |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 11 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Missouri |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1930
Polk, Iowa
Daughter, age 21
Polk, Iowa · implied b. ~1909 — 4 household members
| Surname | Griffin |
| Given Name | Margaret |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 21 |
| Marital Status | Single |
| Birthplace | Iowa |
| Father's Birthplace | Illinois |
| Mother's Birthplace | Missouri |
| Occupation | Telephone Operator |
| Industry | A. T. & T. Co. Main Office |
| Class of Worker | W |
| Can Read/Write | Yes |
| Birth State | Iowa |
| Birth Country | United States |
| Birthplace (normalized) | iowa |
1940
Polk-County, Iowa
Daughter, age 31
Polk-County, Iowa · implied b. ~1909 — 3 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Griffen |
| Given Name | Marie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 31 |
| Marital Status | Single |
| Birthplace | Iowa |
| 1935 Residence (City) | Des Moines City |
| 1935 Residence (County) | Polk |
| Occupation | Steno |
| Industry | Dept. Store |
| Class of Worker | PW |
| Hours Worked | 48 |
| Income (1939) | 960 |
| 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 Margaret Griffin across 3 US Census years (1920, 1930 and 1940) in 2 locations, using XGBoost record linkage. Identified parents: father D Griffen (~0.92 confidence) and father Harry Griffin (~0.92 confidence) and mother Mary Griffen (~0.92 confidence) and mother May Griffin (~0.92 confidence). The pedigree spans 1 generation with 4 identified ancestors.
Show:
Gen 1
Parents
confidence ≈ 0.92
Father
D Griffen
b. ~1879
Source father
● Household
· direct · ~0.92
Father
Harry Griffin
b. ~1883
Source father
● Household
· direct · ~0.92
Mother
Mary Griffen
b. ~1884
Source mother
● Household
· direct · ~0.92
Mother
May Griffin
b. ~1883
Source mother
● Household
· direct · ~0.92
This person
Anchor record
Margaret Griffin
Daughter · 1930 · age 21 · b. ~1909 · Iowa
★ You are viewing this record
Sibling
Bernice Griffin
Sibling · 1930 · age 13
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 — Polk, Iowa
Open full size
1930 US Federal Census — Polk, Iowa
Page Contents
40 people indexed on this census page (ia:1930:iowacensus00reel678:0370)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | David Lewis | 52 | Head | Miner | England |
| 52 | Lois Lewis | 52 | Wife-H | — | England |
| 53 | Edith V Lewis | 27 | Daughter | Supervisor | England |
| 54 | George Lewis | 16 | Son | — | French Canada |
| 55 | Sarah Safely | 51 | Head-H | — | Iowa |
| 56 | Mable Brooks | 27 | niece | Clerk | Iowa |
| 57 | Harold Swallow | 22 | lodger | Fireman | Iowa |
| 58 | Robert Newton | 22 | son | Locomotive Fireman | Iowa |
| 59 | Walter S. Sharpe | 52 | Head | Physician | Illinois |
| 60 | Mabel C. Sharpe | 49 | Wife-H | — | Michigan |
| 61 | Eleanore E. Sharpe | 15 | Daughter | — | Michigan |
| 62 | Evelyn E. Sharpe | 14 | Daughter | — | Michigan |
| 63 | Fred R. Morgan | 48 | Head | Locomotive Engineer | Iowa |
| 64 | Alta L. Morgan | 48 | Wife-H | — | Iowa |
| 65 | Francis L. Garris | 13 | lodger | — | Iowa |
| 66 | Charles L. Shepherd | 45 | lodger | Locomotive Engineer | Iowa |
| 67 | James A. Woods | 48 | Head | Machinist | Iowa |
| 68 | Ethel Woods | 44 | Wife-H | — | Iowa |
| 69 | Harry T. Griffin | 47 | Head | Locomotive Engineer | Illinois |
| 70 | Mary Griffin | 47 | Wife-H | — | Missouri |
| 71 | Margaret Griffin THIS PERSON | 21 | Daughter | Telephone Operator | Iowa |
| 72 | Bernice Griffin | 13 | Daughter | — | Iowa |
| 73 | Maris Nash | 51 | Head-H | — | Iowa |
| 74 | Maris L. Nash | 26 | Daughter | Bond Dept. | Iowa |
| 75 | Lorraine Nash | 16 | Daughter | — | Iowa |
| 76 | Myron Nash | 14 | Son | — | Iowa |
| 77 | Margaret Schevers | 39 | sister | Clerk | Iowa |
| 78 | John R. Anderson | 47 | Head | Locomotive Engineer | Iowa |
| 79 | Mary L. Anderson | 43 | Wife-H | — | Iowa |
| 80 | Veda Mary Anderson | 8 | Daughter | — | Iowa |
| 81 | William J. Gordon | 61 | Head | Machinist | Iowa |
| 82 | Hattie Gordon | 59 | Wife-H | — | Iowa |
| 83 | Chester Pratt | 29 | lodger | Coach | Illinois |
| 84 | Onute Holmes | 24 | Head | Salesman | Denmark |
| 85 | Lucille Holmes | 20 | Wife-H | — | Iowa |
| 86 | Clarence Farnes | 53 | Head | Cashier | Iowa |
| 87 | Harriett Farnes | 52 | Wife-H | — | Iowa |
| 88 | Dale F. Farnes | 19 | Son | — | Iowa |
| 89 | Joseph Hartman | 60 | Head | Machinist | Indiana |
| 90 | Adelaide Hartman | 49 | Wife-H | — | Indiana |
Pedigree Summary
Margaret + 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 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)