The cities of Atlanta and Sandy Springs together saw 311 new COVID-19 diagnoses between Oct. 2 and Oct. 6 update reports from the Fulton County Board of Health.

The number of cases increased in all of the main local ZIP codes. The 14-day trend varied, going down in Atlanta and staying the same in Sandy Springs. The trend also varied among local ZIP codes.

A chart of COVID-19 diagnoses by city in Fulton County as shown in an Oct. 6 Board of Health report.

As of Oct. 6, the part of Atlanta within Fulton County had 12,184 COVID-19 diagnoses, up from 11,930 on Oct. 2. Sandy Springs had 2,557 diagnoses, up from 2,500.

Atlanta remains the number one city in the county for COVID-19 diagnoses at 43.1% of the total, and Sandy Springs remained third with 9.1% of the total.

The 14-day trend in new COVID-19 in each city is charted in the report, calculated by comparing the 14 days preceding the previous seven days with the 14-day period before that. In Atlanta, the 14-day trend was down by 19.6% and in Sandy Springs the 14-day trend did not change.

To view the full report, see the county website here.

The report does not state whether the numbers reflect the coronavirus’s spread, the state of testing, or both.

The statistics, which are based on patients’ home addresses, are not completely accurate due to such factors as a large number of patients whose cities or ZIP codes are unknown. Of those diagnosed, their ZIP code was unknown in 766 cases and their home city was unknown in 2,310 cases. All numbers are preliminary and may be adjusted later, including through “data cleaning” — the reassignment of some cases to a different ZIP code or city after further analysis.

The total number of confirmed COVID-19 diagnoses in the county as of Oct. 6 was 28,242, up from 27,785 on Oct. 2. The countywide confirmed death total from the pandemic was revised down to 506 from a previously reported 515. A total of 74 fatalities were being reviewed by Georgia Department of Public Health to confirm the cause of death.

The number of total diagnosed cases and the 14-day trend in the main ZIP codes in Buckhead and Sandy Springs between the Oct. 2 and Oct. 6 reports were as follows.

Buckhead ZIP codes

30305: 788 (up from 773); down 37.5%

30326: 243 (up from 238); up 75%

Sandy Springs ZIP codes

30328: 832 (up from 810); up 4.8%

30350: 628 (up from 613); down 7.3%

Buckhead and Sandy Springs combined ZIP codes

30327: 555 (up from 548); down 50%

30342: 1,215 (up from 1,194); down 6.3%

John Ruch is an Atlanta-based journalist. Previously, he was Managing Editor of Reporter Newspapers.