B A Mason
This is a large family-owned shoe store chain. They have been selling shoes for 100 years, and are now selling footwear online through their huge online store. They sell dress shoes for men (slip ons, dress boots, side zip boots, Oxfords, brogues) and for women (pumps, wedge pumps, slings, boots, sandals, and matching shoes and handbags). They ship within the US only.

Zappos
Top online shoe store offering price protection (they won't be beaten on price) and free shipping. They have a huge range of dress shoes for men and women. The men's range includes lace-ups, Oxfords, slip-ons, dress sandals, and lace-up, slip-on and zip-up dress boots. For women they have bridal shoes, dress boots in many styles, comfort dress shoes, flats, sandals, ankle straps, high heels, platforms, open toes, sling backs and wedges. They ship USA only.

Dress shoes for men and women - more online stores

Stacy Adams Shoes - Men's dress shoes and footwear. Where to buy guide.

OnlineShoes.com - Men's and women's dress, athletic, and casual shoes.

Applause Formal Wear - Mens formal attire and formal clothing including cumberbunds, dress shoes, and cuff links. Order by phone.

The Celtic Dancer - Solo dress kits, shoes, dancewear and school products. Everything for the Irish dancer.

Joy Shoes - Ladies dress and dyeable shoes and named brands.

Men's Shoe Warehouse - Dress, casual shoes, and boots made in Italy.

Maryland Square Shoes - Offers name brand women's shoes in a variety of styles including athletic, dress, and casual.

ShoeCrafters - Bridal, dress and casual shoes for women..

Stuart Weitzman - Designer dress, evening, bridal and casual shoes. Sizes 4-14.

Trotters - Women's hand woven leather dress shoes, sandals, boots, loafers and moccasins.

The Shoelaces Place - Laces for hockey skates, hiking boots, and dress shoes.

The Scottish Kilt Store - Kilts, sporrans, jackets, shoes and sgians dubh. Full Highland Dress, shipped worldwide from Livingston.

Tony Shoes Inc. - Shoes for the entire family. Dress, casual, boots, and fashion.

Zappos - Featuring dress, casual and athletic shoes for men and women.

Marg of Pepper Pike - Dress shoes personalized with custom accessories. Also offers customized purses.

Deer Stags Shoes - Comfort footwear for men and women. Dress and casual shoes and boots.

Shoe Mall - Selection of men's and women's name brand athletic, work and dress shoes.

Unityshoes.com - Offers light, comfortable shoes for men. Sytles include clubbing, casual, dress, and eurodress shoes.

Mephisto Comfort - Offers Mephisto shoes, boots, sandals, and accessories for men and women. Styles include walking, golf, and dress shoes.

FrenchComfort.com - Offers women's comfort shoes and boots by Arche, exclusively made in France, in dress and casual styles.

The Walking Company - Selection of dress and casual shoes designed for comfort.

Alden Shoes - Men's dress shoes sold online.

Bexley - French based retailer of men's dress and casual shoes.

ShoeMart - Dress and Athltic shoes. Hard to find sizes available.

Alex's Shoe Hospital - Dress and casual shoes including Johnston & Murphy, and Allen-Edmonds.