The Orange County apartment market vacancy rate, below 3.0% for a while, has been creeping slowly upward. By the middle of 2018, it had reached 4.0%. A year later it was 4.2% and was up 10 basis points from a quarter earlier. At $1,968 and $1,898 per month, second quarter 2019 asking and effective averages were up 1.4% apiece year-to-date. Increases for the second quarter alone were 0.7% each.