@alohamolly south wales argus and wales online are stating 16:
From Wales Online (last updated 5 hours ago):
A sixth person died from the virus on Tuesday in the UK, which has a total of 382 cases. On Tuesday (March 8), Chief Medical Officer for Wales Dr Frank Atherton confirmed that a further nine patients had tested positive for the virus, bringing the country's total to 15.
From south Wales Argus: 12:23pm
Second case of coronavirus in Newport
A worker at the Office for National Statistics in Newport has tested positive for coronavirus.
The case is the second in Newport, and raises the total number of cases in Wales to 16.
A spokesperson for the Office for National Statistics said: "There has been one confirmed case of the COVID-19 virus at the ONS site in Newport and we are taking appropriate steps to protect the well-being of all our people.
"The Newport site remains open although we will continue to monitor our operations in the line with official public health and government guidance."
So from what I know so far:
1 in Swansea
2 in Pembrokeshire
1 in Neath Port Talbot
1 in Cardiff (poss second yesterday as a worker tested positive in office next door)
2 in Newport
That leaves 10 unknown locations from the info I can find.