What are the locations that contains market stalls in Skyrim?

From memory, these cities:

Whiterun, Riften, Markath, Solitude, Windhelm

have market stalls, but are there other locations with market stalls that I have missed?

Solution 1:

You forgot one city and it's Raven Rock from the second DLC.

Whiterun

Riften

Raven Rock

Markarth

Solitude

Windhelm

Solution 2:

Marketplace stalls can only be found in the five major cities of Skyrim, so your list is complete.
The vendors with market stalls are:

Whiterun

• Carlotta Valentia
• Anoriath
• Fralia Gray-Mane

Riften

• Brand-Shei
• Grelka
• Madesi
• Marise Aravel

Markarth

• Kerah
• Hogni Red-Arm

Solitude

• Addvar (/Greta)
• Evette San
• Jala

Windhelm

• Aval Atheron
• Hillevi Cruel-Sea
• Niranye