“Bubble Watch” digs into trends that may indicate economic and/or housing market troubles ahead.

Buzz: Orange Countians dramatically slow their homebuying.

Source: CoreLogic

Trend reported: My trusty spreadsheet, reviewing homebuying data for August through November, found 11,429 Orange County residences sold in the period. That’s off 13.3 percent from the same four months in 2017. But more notably, it was the slowest-selling August-to-November since 2011, when the market was still shaking off the damage of the Great Recession.

Dissection: Here are nine trends you should know about this period just after the traditional home-selling push …

1. Orange County’s median selling price for all residences was $725,000 — up 3.6 percent compared with a year earlier. What’s selling has yet to fully reflect the purchasing slowdown.

2. At the neighborhood level, prices were up in 56 of 83 Orange County ZIP codes compared with the previous year. So, pricing resilience is not universal.

4. Sales rose in only 17 of the 83 ZIPs, a rather broad-based dip, geographically speaking.

5. Resales of existing residences totaled 9,738 — down 14 percent from a year earlier. It’s been relatively rough for some homeowners to unload property.

6. New-home sales were 1,691 — down 8.9 percent from a year ago. Builders didn’t have much more luck.

7. In the 27 least-expensive ZIP codes — median sales price at $635,000 and below — 2,955 homes sold. That’s down 17.7 percent compared with ’17. Mortgage rate hikes hit bargain hunters hard.

8. In the 27 priciest ZIPs — median sales price beginning at $834,500 and higher — 4,064 homes sold. That’s down 14.9 percent compared with ’17. Deeper pockets balked, too.

9. Another way to see the upper crust’s cooling: There were 10 Orange County ZIP codes with median selling prices above $1 million vs. 12 in August-November ’17. Gone from the seven-figure club were Dana Point 92629 and Irvine 92620.

Other data: In the year ended July 1, Orange County’s population rose 10,962 — 0.34 percent — to 3.22 million. Yearly growth of residents is down 55 percent vs. an average 24,304 annually in the previous five years. That trend, if it holds, could require fewer homes.

How bubbly?