Adams Morgan in Northwest Washington is a thriving community of small and locally owned businesses. (Alfredo Duarte Pereira/El Tiempo Latino)

Real estate values in neighborhoods like Wicker Park in Chicago, Adams Morgan in Washington and The Haight in San Francisco grew 54 percent more during the past 14 years than in their respective cities or counties, said Matt Cunninghamof Civics Economics, the analytics firm that conducted the study.

“Basically, if we started with a $200,000 house in 1996, it’s a difference between a current-day value of $574,000 versus $466,000,” Cunningham said.

The study, which was commissioned by American Express Open, identified 27 neighborhoods with high concentrations of homegrown shops, restaurants and bars in 15 American cities, including Boston, Detroit and San Francisco. Researchers then culled home sales data from and compared prices across neighborhoods, cities and counties.

“This reinforces that smaller, locally owned business districts really do create value and vibrancy,” Cunningham said. “People want to live — and like living — in these neighborhoods.”

There’s also a broader message to cities, Cunningham said: Cultivating pockets of small business can be a valuable tool for boosting job creation and home values.

“Often we think of small businesses are just little storefronts,” Cunningham said. “But when they join together in a neighborhood, the sum is much greater than the parts.”

Neighborhoods ranked by number of independentally owned retailers:

1. Little Italy, Manhattan (New York City)

2. Plymouth (Detroit)

Design District (Miami)

3. Scottsdale (Phoenix)

4. Andersonville (Chicago)

5. Greenpoint, Brooklyn (New York City)

Uptown (Phoenix)

6. Abbot Kinney Boulevard (Los Angeles)

7. The Haight (San Francisco)

8. Melrose (Los Angeles)

9. Italian Market (Philadelphia)

10. Northern Liberties (Philadelphia)

11. Downtown Detroit (Detroit)

12. Jackson Heights, Queens (New York City)

13. Ballard (Seattle)

14. Virginia Highland (Atlanta)

15. Allston (Boston)

16. North End (Boston)

17. Lower Greenville (Dallas)

18. Adams Morgan (Washington)

19. Uptown & Lyn-Lake (Minneapolis)

20. Downtown Coral Gardens (Miami)

21. Pacific Beach (San Diego)

22. Wicker Park-Bucktown (Chicago)

Georgetown (Washington)

23. The Castro (San Francisco)

Hillcrest & North Park (San Diego)

Neighborhoods ranked by number of independentally owned restaurants and bars:

1. Andersonville (Chicago)

2. North End (Boston)

Design District (Miami)

Italian Market (Philadelphia)

Little Italy, Manhattan (New York City)

3. The Castro (San Francisco)

4. Virginia Highland (Atlanta)

5. Northern Liberties (Philadelphia)

6. Melrose (Los Angeles)

7. The Haight (San Francisco)

8. Greenpoint, Brooklyn (New York City)

9. Uptown & Lyn-Lake (Minneapolis)

10. Adams Morgan (Washington)

11. Lower Greenville (Dallas)

12. Wicker Park-Bucktown (Chicago)

13. Allston (Boston)

14. Pacific Beach (San Diego)

15. Hillcrest & North Park (San Diego)

16. Abbot Kinney Boulevard (Los Angeles)

17. Georgetown (Washington)

18. Ballard (Seattle)

19. Scottsdale (Phoenix)

20. Jackson Heights, Queens (New York City)

21. Plymouth (Detroit)

22. Downtown Detroit (Detroit)

23. Downtown Coral Gardens (Miami)

24. Uptown (Phoenix)