Overall
- Boise City
- 98.4
- Rapid City
- 89.2
Diff -9.2 RPP
Boise City vs Rapid City
Cost of living comparison based on BEA Regional Price Parities. Rapid City is 9.4% less expensive than Boise City.
9.4% less expensive
Rapid City, SD is 9.4% less expensive than Boise City, ID on BEA Regional Price Parities (overall RPP 89.2 vs 98.4). A $100,000 salary in Boise City buys about the same as $90,618 in Rapid City; the largest component gap is rents.
- Overall RPP 98.4 (Boise City) vs 89.2 (Rapid City)
- $100k in Boise City ≈ $90,618 purchasing power in Rapid City
- Rents drives the gap (-33.0 RPP points)
RPP parity plate
Pair ID:SD 98.4→89.2
TIER-GAP · CROSS-STATE · SPLIT-BUDGET · BOTH-BELOW · PP-SHIFT
- TIER-GAP Clear tier gap
- CROSS-STATE ID × SD
- SPLIT-BUDGET Split budget
- BOTH-BELOW Both below 100
- PP-SHIFT PP shift
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.
Category Breakdown
Goods
- Boise City
- 96.2
- Rapid City
- 95.5
Diff -0.7 RPP
Services
- Boise City
- 70.7
- Rapid City
- 79.1
Diff +8.4 RPP
Rents
- Boise City
- 105.6
- Rapid City
- 72.6
Diff -33.0 RPP
| Category | Boise City | Rapid City | Difference |
|---|---|---|---|
| Overall | 98.4 | 89.2 | -9.2 |
| Goods | 96.2 | 95.5 | -0.7 |
| Services | 70.7 | 79.1 | +8.4 |
| Rents | 105.6 | 72.6 | -33.0 |
Visual Comparison
Overall
Boise City 98.4
Rapid City 89.2
Goods
Boise City 96.2
Rapid City 95.5
Services
Boise City 70.7
Rapid City 79.1
Rents
Boise City 105.6
Rapid City 72.6
Vertical line = national average (100)
What This Comparison Actually Tells You
Rents creates the largest separation: Rapid City is 33.0 points lower. But services move against the overall direction, so this is a split budget rather than a clean across-the-board winner.
Boise City, ID and Rapid City, SD sit in clearly different price tiers, separated by 9.2 RPP points. At this distance, treating the same nominal salary as equivalent would materially change purchasing power.
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.
Comparable population context is incomplete for this pair, so no market-scale explanation is inferred from the price indexes.
For a housing-sensitive move, validate the rent gap first: HUD Fair Market Rent and the actual unit size can overturn what the blended index implies. On the BEA ratio alone, $100,000 in Boise City corresponds to $90,618 in Rapid City.
Boise City
98.4
Cost Index
Rapid City
89.2
Cost Index
Salary Equivalents
What a salary in Boise City would need to be in Rapid City for the same purchasing power:
| In Boise City | In Rapid City | Difference |
|---|---|---|
| $50,000 | $45,309 | $-4,691 |
| $75,000 | $67,964 | $-7,036 |
| $100,000 | $90,618 | $-9,382 |
| $150,000 | $135,927 | $-14,073 |
$ in Boise City = in Rapid City
Same BEA Regional Price Parity ratio as the table above (98.4 → 89.2), computed live from your number, nothing is sent anywhere.
Frequently Asked Questions
Is Rapid City more expensive than Boise City?
Rapid City is 9.4% less expensive than Boise City. The overall cost index is 89.2 vs 98.4 (national average = 100).
What salary in Rapid City equals $100K in Boise City?
A $100,000 salary in Boise City has the same purchasing power as $90,618 in Rapid City. This is based on the BEA Regional Price Parity indexes.
How do rents compare between Boise City and Rapid City?
Rents in Boise City are indexed at 105.6 while Rapid City is at 72.6 (national average = 100). Boise 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.