MF
Mary Frederick — 1920 US Census Record
Linked across censuses1920 United States Federal Census · None, Maryland
Our Model Tree links this Mary Frederick across the 1910 and 1920 US Censuses in Maryland (XGBoost, ~Confirmed) — first a daughter (b.~1904), then head of a 6-person household.
Age 16
b. ~1904
Female
Daughter
Born: Maryland
Single
1920 Census Record Details
| Census Year | 1920 |
| Location | None, Maryland |
| Surname | Frederick |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Additional Details | |
| Occupation | Clerk |
| Industry | Grocery Store |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
| Occupation | Clerk |
| Township / Ward | Baltimore |
| 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.
6 people recorded at the same address in the 1920 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Charles Langer | Son | — | 8 | ~1912 |
| Elizabeth Frederick | Daughter | — | 35 | ~1885 |
| Mary Frederick | Daughter | — | 16 | ~1904 |
| Mary Ryan | Spouse | — | 59 | ~1861 |
| John Frederick | Son | — | 13 | ~1907 |
| John Ryan | Head | — | 69 | ~1851 |
Census Appearances
1910
Baltimore, Maryland
Daughter, age 6
Baltimore, Maryland · implied b. ~1904 — 5 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Frederick |
| Given Name | Marie |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 6 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
1920
None, Maryland
Daughter, age 16
None, Maryland · implied b. ~1904 — 6 household members
| Surname | Frederick |
| Given Name | Mary R. |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | White |
| Age | 16 |
| Marital Status | Single |
| Birthplace | Maryland |
| Father's Birthplace | Maryland |
| Mother's Birthplace | Maryland |
| Occupation | Clerk |
| Industry | Grocery Store |
| Class of Worker | W |
| Can Read | Yes |
| Can Write | Yes |
| Speaks English | Yes |
| Birth State | Maryland |
| Birth Country | United States |
| Birthplace (normalized) | maryland |
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 Frederick across 2 US Census years (1910 and 1920) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Frederick
Daughter · 1920 · age 16 · b. ~1904 · Maryland
★ You are viewing this record
Sibling
Elizabeth Frederick
Sibling · 1920 · age 35
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Charles Langer
Sibling · 1920 · age 8
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
John Frederick
Sibling · 1920 · 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
1920 US Federal Census — None, Maryland
Open full size
1920 US Federal Census — None, Maryland
Page Contents
50 people indexed on this census page (ia:1920:14thcensusofpopu669unit:0083)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 51 | John E. Ryan | 69 | Head | Salesman | Virginia |
| 52 | Mary M. Ryan | 59 | Wife | None | Virginia |
| 53 | Elizabeth A. Frederick | 35 | Daughter | Milliner | Maryland |
| 54 | Mary R. Frederick THIS PERSON | 16 | Daughter | Clerk | Maryland |
| 55 | John R. Frederick | 13 | Son | Clerk | Maryland |
| 56 | Charles B. Langer | 8 | Son | None | Maryland |
| 57 | John Langan | 50 | Head | None | Maryland |
| 58 | Lillian Langan | 25 | Wife | Clerk | Maryland |
| 59 | Jane Langan | 1 | Daughter | None | Maryland |
| 60 | John M. Hitchcock | 64 | Head | None | Maryland |
| 61 | Elsie R. Hitchcock | 38 | Son | None | Maryland |
| 62 | William G. Hitchcock | 39 | Daughter | Stenographer | Maryland |
| 63 | George S. Mepham | 42 | Head | Molder | Maryland |
| 64 | Maud S. Mepham | 42 | Wife | Engineer | Maryland |
| 65 | Rome R. Erdman | 30 | Head | Merchant | Maryland |
| 66 | Ruth E. Erdman | 27 | Wife | None | Maryland |
| 67 | Charlotte R. Erdman | 5 | Daughter | None | Maryland |
| 68 | Kate Grover | 75 | Mother-in-law | None | Maryland |
| 69 | Charles H. Gort | 47 | Head | Nurse | Maryland |
| 70 | Lula M. Gort | 54 | Wife | Audit Engr. | Maryland |
| 71 | Lillian E. Treari | 35 | Head | None | Maryland |
| 72 | Mary L. Treari | 29 | Daughter | None | Maryland |
| 73 | Helen M. Treari | 11 | Daughter | None | Maryland |
| 74 | Russell Meagher | 25 | Head | Clerk | Maryland |
| 75 | Mary Meagher | 24 | Wife | None | Maryland |
| 76 | Anthony R. Zonderman | 60 | Head | Clerk | Maryland |
| 77 | Mary Zonderman | 49 | Wife | None | Maryland |
| 78 | H. Harry Frohme | 46 | Head | Money At Hand | Maryland |
| 79 | G. May Frohme | 45 | Wife | None | Delaware |
| 80 | Dorothy M. Frohme | 14 | Daughter | None | Maryland |
| 81 | Anna E. Frohme | 11 | Daughter | None | Maryland |
| 82 | George Anstey | 45 | Head | Leather Merchant | Maryland |
| 83 | Mary E. Anstey | 48 | Wife | None | Maryland |
| 84 | Gareth R. Anstey | 18 | Daughter | None | Maryland |
| 85 | Mary E. Anstey | 16 | Daughter | None | Maryland |
| 86 | George Anstey | 11 | Son | None | Maryland |
| 87 | Margaret G. Anstey | 10 | Daughter | None | Maryland |
| 88 | James G. Moore | 52 | Uncle | Salesman | Maryland |
| 89 | Manda Lonie | 54 | Servant | Servant | Maryland |
| 90 | John R. Buffington | 37 | Head | Merchant | Maryland |
| 91 | Jessie Buffington | 32 | Wife | None | Maryland |
| 92 | John R. Buffington | 8 | Son | None | Maryland |
| 93 | James G. Buffington | 5 | Son | None | Maryland |
| 94 | Mary M. Buffington | 3 | Daughter | None | Maryland |
| 95 | Frederick Millek | 45 | Head | Bookkeeper | Maryland |
| 96 | Rosa B. Millek | 49 | Wife | Salesman | Maine |
| 97 | Joseph H. Freeland | 56 | Head | Production Mgr. | Maryland |
| 98 | Kathryn M. Freeland | 56 | Wife | None | Michigan |
| 99 | Isabel C. Freeland | 26 | Daughter | None | Michigan |
| 100 | Freeland | 21 | Daughter | None | Michigan |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1920 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)