Fairfax County Coronavirus Cases Grouped By Combined Zip Codes

FAIRFAX COUNTY, VA — The Fairfax County Health Department has released more specifics on cases of the new coronavirus with the launch of a new data site. Information includes cases by locality and four zip code clusters, the trajectory of cases, race and ethnicity data and new cases per week. Data on hospitalizations and deaths is not provided.

As of Monday, there are 3,002 cases in Fairfax County, or 260.9 cases per 100,000 people. The 27 cases in the City of Fairfax represents 109.9 cases per 100,000, and 26 in the City of Falls Church represents 176 per 100,000 people. According to the Virginia Department of Health, Fairfax County reported 100 deaths, while the cities of Fairfax and Falls Church each have two deaths.

Data by zip code is grouped by the first three digits of a zip code to protect patient privacy, the health department says. The 220 zip codes represent different parts of the county, 221 zip codes are located in northern Fairfax County, 223 zip codes are in southeastern Fairfax County and 201 zip codes are in western Fairfax County.

Here are the case totals and rate per 100,000 for these zip code clusters:

• 220 zip codes: 1,253 cases, or 264.8 per 100,000 people
• 221 zip codes: 618 cases, or 252.4 per 100,000 people
• 223 zip codes: 601 cases, or 208.9 per 100,000 people
• 201 zip codes: 485 cases, or 138.9 per 100,000 people

For the county and two cities as a whole, the rate of cases per 100,000 increase with older age groups. The health department cautions that older adults and people with underlying health conditions are more likely to be tested due to higher risk of severe complications from COVID-19 illness.

Here is the case rate by age group:

• Ages 0-17: 77 cases, or 27.5 per 100,000 people
• Ages 18-49: 1,549 cases, or 299.9 per 100,000 people
• Ages 50-64: 796 cases, or 337.2 per 100,000 people
• Ages 65 and up: 633 cases, or 423.8 per 100,000 people

The health department compares racial ethnic makeup of cases as compared to the population. Data is missing for 773 of these cases, or 25.5 percent. When excluding cases with missing racial ethnic data, Hispanic individuals had the highest percentage of cases. While Hispanic individuals represent 16.8 percent of the population, they make up 48.7 of cases, excluding those with missing data. White individuals represent 26.9 percent of cases, Asian individuals represent 14.3 percent of cases, and black individuals represent 10.1 percent of cases.

The new data also visualizes the trajectory of cases in a graph with week-to-week growth of total cases and new confirmed cases. A straight line trending up and to the right represents exponential case growth, meaning the rate of new cases is equal to the rate of existing cases. That no longer appears to be the case in recent weeks, as the number of new cases is no longer matching the total cases. If the line starts to trend downward, that would demonstrate a slowdown of new cases.

The number of new cases by week shows how the new coronavirus epidemic is progressing. Data may be incomplete for the past three weeks due to the time between exposure and symptom onset, as well as the time to receive testing results.

The number of new cases by week for the Fairfax Health District is:

• Feb. 28: Four cases
• March 1: 27 cases
• March 8: 103 cases
• March 15: 247 cases
• March 22: 305 cases
• March 29: 411 cases
• April 5: 532 cases (incomplete)
• April 12: 552 cases (incomplete)
• April 19: 149 cases (incomplete)

See the full set of case data at www.fairfaxcounty.gov/covid19/case-information.