Apostolic Women

The Greek word Apostolos, means "one sent out." Though this was the word used for the 12 male Apostles (who had been the Disciples of the Lord) as well as the Seventy Apostles, there were also woman whose lives are called 'apostolic'. Many more women of the early Church were also co-laborers with the Twelve or Seventy Apostles. Several of these women are mentioned by name in the Epistles of the New Testament, while others we know by other written or oral traditions in the Church.

Men or women Saints engaged in Apostolic labors are often remembered with the title: Equal-to-the-Apostles (especially those Saints who lived after the lives of the Apostles). 

Almost all of these women bear the title Equal to the Apostles (as well as the other names listed).

Saints:

1. Apphia, co-laborer and wife of St. Philemon of the Seventy
2. Chloe, co-laborer with the Apostle Paul 
3. Helen the Empress
4. Junia, co-laborer with St. Andronicus the Seventy
5. Lydia of Philippi, (1st European baptized) (here and here) 
6. Mariamne, sister of the Apostle Philip
7. Mary Magdalene, Apostle to the Apostles
8. Myrrh-bearers (the Holy,) who proclaimed the Resurrection
9. Nana, Queen of Iberia 
10. Nino of Georgia, Enlightener of Georgia
11. Olga of Kiev
12. Oraiozili, disciple of the Apostle Andrew, Martyr 
13. Photini the Martyr; the Samaritan woman 
14. Polyxene of Spain (&Xanthippe), Disciple of the Apostles (& here)
15. Priscilla, wife of the Apostle Aquila
16. Thekla the Protomartyr, disciple of the Apostle Paul
17. Xanthippe of Spain, Disciples of the Apostles (as example for our lives)

Additional women mentioned (but I can't find information about if they're Saints):

1. Euodia and Syntyche
2. Mary, Tryphena, Tryphosa, and Persis 
3. Nympha 

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Note:

The Martyrs Inna, Pinna, and Rimma (disciples of St. Andrew) were three men, though often mistaken more recently--by the sound of their names-- for women. Another way of spelling their names were: Innas, Pinnas, and (sometimes) Nirras.