Cassidy vs Mia
How Cassidy and Mia compare across 146 years of US Social Security Administration baby-name records — popularity history, peak years, current rank, and which name overtook which.
US Popularity History — Side-by-Side
Annual US births named Cassidy (girls) vs Mia (girls), from US Social Security Administration national records.
Source: US Social Security Administration. Names appearing fewer than 5 times per year are suppressed by SSA.
Quick Stats
| Metric | Cassidy | Mia |
|---|---|---|
| Peak year (most US births) | 1999 — 3,395 girls | 2015 — 14,939 girls |
| Peak rank | #99 | #6 |
| Most recent rank (2025) | #541 (558 births) | #6 (11,078 births) |
| Total US births since 1880 | 39,704 | 280,686 |
| Last 10 years (2016–2025) | 7,759 | 121,307 |
Peak comparison takeaway
At its all-time peak, Mia reached 14,939 US births in 2015 — 11,544 more than Cassidy's peak count.
Crossover Years
Years where one name first passed the other in annual US births. A name "winning" in a year means it had more births that year, not necessarily a higher rank.
| Year | New leader | Cassidy births | Mia births |
|---|---|---|---|
| 2000 | Mia | 3,163 | 3,451 |
Strongest States — Last 10 Years
States where each name ranked highest, from SSA's state-level dataset. Lower average rank = name appears closer to the top of that state's girls-name list.
Cassidy — top 5 states
| # | State | Avg rank | Births |
|---|---|---|---|
| 1 | Delaware | #151 | 25 |
| 2 | Alaska | #162 | 15 |
| 3 | South Dakota | #204 | 16 |
| 4 | Pennsylvania | #248 | 442 |
| 5 | New Mexico | #256 | 36 |
Mia — top 5 states
| # | State | Avg rank | Births |
|---|---|---|---|
| 1 | New Mexico | #2 | 775 |
| 2 | California | #3 | 19,952 |
| 3 | New Jersey | #3 | 3,970 |
| 4 | Nevada | #3 | 1,236 |
| 5 | Texas | #4 | 14,721 |
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Data & methodology
Source: US Social Security Administration national baby names dataset 1880–2025 (CC0 public domain). Names with fewer than 5 occurrences in a given year are suppressed by SSA. State-level coverage runs 1910–2025. Crossover detection compares annual birth counts (not ranks) for each year both names appear. Methodology: see full notes. More comparisons →