Overall
- Rapid City
- 89.2
- Ames
- 88.8
Diff -0.3 RPP
Rapid City vs Ames
Cost of living comparison based on BEA Regional Price Parities. Ames is 0.4% less expensive than Rapid City.
0.4% less expensive
Ames, IA is 0.4% less expensive than Rapid City, SD on BEA Regional Price Parities (overall RPP 88.8 vs 89.2). A $100,000 salary in Rapid City buys about the same as $99,630 in Ames; the largest component gap is services.
- Overall RPP 89.2 (Rapid City) vs 88.8 (Ames)
- $100k in Rapid City ≈ $99,630 purchasing power in Ames
- Services drives the gap (+3.9 RPP points)
RPP parity plate
Pair SD:IA 89.2→88.8
PHOTO-FINISH · CROSS-STATE · SPLIT-BUDGET · BOTH-BELOW · PP-PAR
- PHOTO-FINISH Photo finish
- CROSS-STATE SD × IA
- SPLIT-BUDGET Split budget
- BOTH-BELOW Both below 100
- PP-PAR PP near-par
Instrument codes from this pair's BEA Regional Price Parities (overall · goods · services · rents · national benchmark 100 · purchasing-power conversion), not a ranking or recommendation.
Rapid City
89.2
Cost Index
Ames
88.8
Cost Index
What This Comparison Actually Tells You
Rapid City, SD and Ames, IA are a photo finish on overall price level, only 0.3 RPP points apart. A salary conversion is therefore a fine adjustment, not evidence of a fundamentally different cost regime.
Services creates the largest separation: Ames is 3.9 points higher. But services move against the overall direction, so this is a split budget rather than a clean across-the-board winner.
Comparable population context is incomplete for this pair, so no market-scale explanation is inferred from the price indexes.
Both metros remain below the U.S. benchmark of 100. This comparison chooses between two below-average price levels; “more expensive” here does not mean nationally expensive.
For a service-heavy household, test childcare, health, and other locally supplied costs before relying on rent alone. The BEA ratio converts $100,000 in Rapid City to $99,630 in Ames, but it is not a personal spending weight.
Category Breakdown
Goods
- Rapid City
- 95.5
- Ames
- 93.7
Diff -1.7 RPP
Services
- Rapid City
- 79.1
- Ames
- 83.0
Diff +3.9 RPP
Rents
- Rapid City
- 72.6
- Ames
- 69.2
Diff -3.4 RPP
| Category | Rapid City | Ames | Difference |
|---|---|---|---|
| Overall | 89.2 | 88.8 | -0.3 |
| Goods | 95.5 | 93.7 | -1.7 |
| Services | 79.1 | 83.0 | +3.9 |
| Rents | 72.6 | 69.2 | -3.4 |
Visual Comparison
Overall
Rapid City 89.2
Ames 88.8
Goods
Rapid City 95.5
Ames 93.7
Services
Rapid City 79.1
Ames 83.0
Rents
Rapid City 72.6
Ames 69.2
Vertical line = national average (100)
Salary Equivalents
What a salary in Rapid City would need to be in Ames for the same purchasing power:
| In Rapid City | In Ames | Difference |
|---|---|---|
| $50,000 | $49,815 | $-185 |
| $75,000 | $74,722 | $-278 |
| $100,000 | $99,630 | $-370 |
| $150,000 | $149,445 | $-555 |
$ in Rapid City = in Ames
Same BEA Regional Price Parity ratio as the table above (89.2 → 88.8), computed live from your number, nothing is sent anywhere.
Frequently Asked Questions
Is Ames more expensive than Rapid City?
Ames is 0.4% less expensive than Rapid City. The overall cost index is 88.8 vs 89.2 (national average = 100).
What salary in Ames equals $100K in Rapid City?
A $100,000 salary in Rapid City has the same purchasing power as $99,630 in Ames. This is based on the BEA Regional Price Parity indexes.
How do rents compare between Rapid City and Ames?
Rents in Rapid City are indexed at 72.6 while Ames is at 69.2 (national average = 100). Rapid City has higher rents.
Data sources
- BEA Regional Price Parities (RPP), the cost-of-living indices shown on this page
- U.S. Census Bureau, American Community Survey (ACS), gross-rent observations behind the rents component
- BLS Consumer Price Index (CPI), goods and services price relatives
- BLS Occupational Employment and Wage Statistics (OEWS), labor-driven services component
- HUD Fair Market Rents (FMR), 40th-percentile rent cross-reference
Every figure on PlainCost is rendered directly from BEA Regional Price Parity source data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, our changelog, or report a data error. Data current as of 2026-08-11. Rankings measure the published cost-of-living index only; we don't recommend where to live or rate any metro's quality of life.