County profile · Idaho
Gem County, ID market data
How Gem County compares with other counties for 56 business types: competitors, household spending, official counts and growth.
- Population, 2025
- 21,773
- +13.0% since 2020
- Households
- 7,643
- Median household income
- $64,605
- +42.0% vs. 2015–2019, before inflation
- Median home value
- $428,700
- Jobs located here
- 4,657
- Highest market score
- 82
- Gas stations, #120 of 2,358 scored counties
A site report maps the competitors on map listings around any address in Gem County by name and distance, and the households and spending within reach. Or open the report at the center of Gem County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardSurvey estimates 2020–2024 · population estimates 2025 · official business counts 2023 · map listings September 2026 · Data credits · How we measure
What this means
Gem County has an estimated 21,773 people and 7,643 households. Population estimates show Gem County grew 13.0% from 2020 to 2025, faster than the U.S. (+3.1%). Median household income in Gem County is $64,605, 20% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 42.0%, before inflation.
Relative to the U.S., household spending in Gem County runs highest on vehicle maintenance and repairs (an index of 134, where 100 is the U.S. average) and lowest on clothing, shoes and related services (80).
Of the business types scored in Gem County, gas stations (82); salons, barbers and spas (76); and restaurants and cafes (76) have the highest Groundwork market scores. For gas stations, that ranks #120 of 2,358 scored counties.
Gem County is part of the Boise City metro area. Against the U.S., map listings per household run highest for pet businesses (2.5 times the U.S. rate) and lowest for real estate businesses (59% below the U.S. rate).
All 56 business types in Gem County
Highest Groundwork market score first. Each score compares Gem County with other counties for that business type, from 0 to 100. Spending per listing divides a whole spending line (all vehicle repairs, all eating out) by one type’s listings: the demand for each competitor, not a business’s revenue. Compare it across markets with its index, where 100 is the U.S. figure for the same type; the real estate types, whose line is all housing costs, show the index only. How the score works.
| Business type | Score | Rank among counties | Listings | Per 10k households | Spending per listing | Spending per listing vs. U.S. (100) | Official establishments |
|---|---|---|---|---|---|---|---|
| Gas stations | 82 | #120 of 2,358 | 10 | 13.1 | $2.5M | 107 | 7 |
| Salons, barbers and spas | 76 | #153 of 2,385 | 23 | 30.1 | $308K | 145 | Under 3 |
| Restaurants and cafes | 76 | #224 of 2,405 | 57 | 74.6 | $478K | 129 | 23 |
| Sit-down restaurants | 75 | #250 of 2,405 | 30 | 39.3 | $909K | 137 | 10 |
| Bakeries and dessert shops | 72 | #221 of 1,889 | 5 | 6.5 | $5.5M | 132 | Under 3 |
| Auto repair and car care | 72 | #297 of 2,401 | 27 | 35.3 | $363K | 135 | 16 |
| Pizza | 71 | #279 of 2,090 | 5 | 6.5 | $5.5M | 107 | 12 |
| Real estate | 69 | #232 of 2,229 | 12 | 15.7 | Index only | 246 | 17 |
| Primary care and pediatrics | 69 | #290 of 1,656 | 5 | 6.5 | $1.8M | 101 | 5 |
| Real estate agents and brokers | 68 | #272 of 2,176 | 10 | 13.1 | Index only | 235 | 12 |
| Gyms, studios and classes | 68 | #329 of 2,088 | 11 | 14.4 | $629K | 95 | Under 3 |
| Fast food and sandwich shops | 67 | #489 of 2,222 | 9 | 11.8 | $3M | 99 | 12 |
| Auto repair shops | 65 | #527 of 2,378 | 19 | 24.9 | $516K | 116 | 14 |
| Convenience stores | 64 | #629 of 2,261 | 7 | 9.2 | $6.3M | 80 | Under 3 |
| Doctors, dentists and clinics | 63 | #631 of 2,394 | 39 | 51.0 | $230K | 151 | 18 |
| Hair salons | 61 | #658 of 2,339 | 17 | 22.2 | $416K | 97 | Under 3 |
| Grocery and convenience stores | 59 | #847 of 2,402 | 17 | 22.2 | $2.6M | 76 | Under 3 |
| Insurance agencies | 58 | #857 of 2,272 | 14 | 18.3 | $1.3M | 103 | 7 |
| Gyms | 56 | #711 of 1,792 | 8 | 10.5 | $865K | 66 | Under 3 |
| Dentists and orthodontists | 56 | #720 of 1,886 | 7 | 9.2 | $1.3M | 130 | 7 |
| Child care and preschools | 51 | #809 of 1,611 | 7 | 9.2 | $598K | 60 | 5 |
| Coffee shops and cafes | 50 | #1,019 of 2,063 | 9 | 11.8 | $3M | 82 | Under 3 |
| Veterinarians | 43 | #926 of 1,485 | 5 | 6.5 | $1.3M | 49 | 3 |
| Chiropractors | 43 | #943 of 1,490 | 6 | 7.9 | $1.5M | 63 | Under 3 |
| Lawn, cleaning and pest control | 42 | #1,194 of 1,771 | 11 | 14.4 | $841K | 50 | 9 |
| Pet businesses | 36 | #1,708 of 2,200 | 20 | 26.2 | $331K | 38 | 7 |
| Home repair trades | 34 | #1,736 of 2,057 | 12 | 15.7 | $1.7M | 68 | 31 |
| Roofing and gutters | 25 | #1,074 of 1,177 | 6 | 7.9 | $3.3M | 39 | 6 |
| Clothing, shoes and laundry | Not scored | Not scored | 4 | 5.2 | $3.1M | 356 | Under 3 |
| House cleaning | Not scored | Not scored | 4 | 5.2 | $2.3M | 36 | Under 3 |
| HVAC and plumbing | Not scored | Not scored | 4 | 5.2 | $5M | 105 | 14 |
| Landscaping and lawn care | Not scored | Not scored | 4 | 5.2 | $2.3M | 79 | 9 |
| Pet grooming and boarding | Not scored | Not scored | 4 | 5.2 | $1.7M | 65 | 4 |
| Pet stores | Not scored | Not scored | 4 | 5.2 | $1.7M | 37 | Under 3 |
| Physical therapy | Not scored | Not scored | 4 | 5.2 | $2.2M | 93 | 6 |
| Barbershops | Not scored | Not scored | 3 | 3.9 | $2.4M | 125 | Under 3 |
| Collision repair and body shops | Not scored | Not scored | 3 | 3.9 | $3.3M | 106 | 8 |
| Grocery stores | Not scored | Not scored | 3 | 3.9 | $14.7M | 158 | Under 3 |
| Martial arts and dance studios | Not scored | Not scored | 3 | 3.9 | $2.3M | 114 | Under 3 |
| Pest control | Not scored | Not scored | 3 | 3.9 | $3.1M | 30 | Under 3 |
| Clothing and shoe stores | Not scored | Not scored | 2 | 2.6 | $6.3M | Too few | Under 3 |
| Electricians | Not scored | Not scored | 2 | 2.6 | $10M | Too few | 11 |
| Mortgage brokers and lenders | Not scored | Not scored | 2 | 2.6 | Index only | Too few | Under 3 |
| Optometrists and eye care | Not scored | Not scored | 2 | 2.6 | $4.5M | Too few | Under 3 |
| Spas and skin care | Not scored | Not scored | 2 | 2.6 | $3.5M | Too few | Under 3 |
| Tire shops | Not scored | Not scored | 2 | 2.6 | $4.9M | Too few | Under 3 |
| Car washes and detailing | Not scored | Not scored | 1 | 1.3 | $9.8M | Too few | Under 3 |
| Funeral homes | Not scored | Not scored | 1 | 1.3 | $1.3M | Too few | Under 3 |
| Laundromats | Not scored | Not scored | 1 | 1.3 | $12.5M | Too few | Under 3 |
| Nail salons | Not scored | Not scored | 1 | 1.3 | $7.1M | Too few | Under 3 |
| Dry cleaners | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
| Home inspectors | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
| Oil change and quick lube | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
| Property management | Not scored | Not scored | 0 | 0.0 | None listed | None listed | 4 |
| Urgent care and walk-in clinics | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
| Yoga, Pilates and fitness studios | Not scored | Not scored | 0 | 0.0 | None listed | None listed | Under 3 |
Household spending in Gem County
What households here spend in a year on each line, in total and per household, with the index against the U.S. average (100).
| Spending line | A year, all households | Per household | Index vs. U.S. (100) |
|---|---|---|---|
| Vehicle maintenance and repairs | $9.8M | $1,284 | 134 |
| Gasoline and other fuels | $25.4M | $3,328 | 128 |
| Food away from home | $27.3M | $3,568 | 88 |
| Groceries | $44M | $5,751 | 91 |
| Personal care products and services | $7.1M | $926 | 92 |
| Child care and other personal services | $4.2M | $548 | 94 |
| Memberships, classes and admissions | $6.9M | $905 | 92 |
| Medical and dental services | $9M | $1,175 | 91 |
| Pets | $6.6M | $865 | 95 |
| Clothing, shoes and related services | $12.5M | $1,639 | 80 |
| Vehicle insurance | $18.1M | $2,373 | 121 |
| Home repairs, maintenance and insurance | $19.9M | $2,606 | 86 |
| Lawn care, cleaning and other household services | $9.3M | $1,211 | 86 |
| Rent and homeowner costs | $128M | $16,743 | 100 |
Household spending is estimated from the incomes of the households in each neighborhood, using what households at each income spent nationally in 2024, adjusted for the region. It counts what residents spend, wherever they spend it.
Population and households in Gem County
- Population, 2025 estimate
- 21,773+13.0% since 2020
- Households
- 7,643
- Median age
- 44.3
- Homes lived in by their owners
- 76%
- Vehicles per household
- 2.4
- Land area
- 560 sq. mi.
- People per square mile
- 37
- Median household income
- $64,605+42.0% vs. 2015–2019, before inflation
- Average household income
- $86,642
- Median home value
- $428,700
- Jobs located here
- 4,657
- Daytime population
- 16,682Residents who don’t work, plus everyone whose job is here
Looking at a specific site in Gem County?
These figures cover the whole county. A site report draws rings around one address and counts what’s inside them: households, spending, jobs, and the competitors on map listings by name and distance, for any of the 56 business types.
Or open the report at the center of Gem County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardRelated markets
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- Ada County, ID518,935 people
- Payette County, ID26,771 people
- Boise County, ID8,273 people
- Owyhee County, ID12,503 people
- Washington County, ID11,142 people
- Valley County, ID12,389 people
- Adams County, ID4,744 people
Questions
How fast is Gem County, ID growing?
Population estimates put Gem County at 21,773 people in 2025, up 13.0% since 2020, faster than the U.S. (+3.1%). It has 7,643 households. Median household income rose 42.0% from the 2015–2019 survey, before inflation.
How much do households in Gem County, ID spend?
Households in Gem County spend about $128M a year on rent and homeowner costs, $44M on groceries and $27.3M on food away from home. Set against the U.S., households in Gem County spend the most on vehicle maintenance and repairs (an index of 134, where 100 is the U.S. average) and the least on clothing, shoes and related services (80).
Which business types have the highest market scores in Gem County, ID?
The highest Groundwork market scores in Gem County are for gas stations (82); salons, barbers and spas (76); and restaurants and cafes (76). Gem County ranks #120 of 2,358 scored counties for gas stations.
How does Gem County, ID compare with the U.S.?
The median household income in Gem County is $64,605 a year, 20% below the U.S. median of $80,734. The population rose 13.0% from 2020 to 2025, against +3.1% for the U.S. The median home value is $428,700, against $332,700 for the U.S. For its number of households, Gem County has the most map listings, relative to the U.S., for pet businesses (2.5 times the U.S. rate) and the fewest for real estate businesses (59% below the U.S. rate).
What is the Groundwork market score?
The Groundwork market score runs from 0 to 100 and compares a market with others of its kind for one business type: states with states, metro areas with metro areas, small-town markets and counties with their own. It weighs household spending per competitor (35%), households per business with payroll (25%), population growth (20%) and spending power (20%), each ranked against those peers. A higher score means that, taken together, the market has more household spending and more households for each business already there, faster population growth and more spending per household than similar markets. It describes a market, not any one site or deal. 28 of the 56 business types have a score in Gem County, each ranked against other counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in Gem County. It maps the competitors on map listings near the site and sizes the households and spending within the distance you choose. New accounts get 10 actions over 3 days, no card.
All markets in Idaho · Every U.S. market · How we measure
Screening a site or an acquisition in Gem County?
A site report maps the competitors on map listings near an address and sizes the households and spending around it.
The button opens the report at the center of Gem County. Signed out, you see a blurred preview; on an account, each report is one action.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Figures are estimates for research only. Not investment or real estate advice.