Siman 689
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א הַכֹּל חַיָּבִים בִּקְרִיאָתָהּ, אֲנָשִׁים וְנָשִׂים וְגֵרִים וַעֲבָדִים מְשֻׁחְרָרִים; וּמְחַנְּכִים אֶת הַקְּטַנִּים לִקְרוֹתָהּ.
1 That all are obligated to read megillah. Containing 6 paragraphs: All are obligated in reading [the megillah]: men, women, converts, and freed slaves. We teach the children to read.
ב אֶחָד הַקּוֹרֵא וְאֶחָד הַשּׁוֹמֵעַ מִן הַקּוֹרֵא, יָצָא יְדֵי חוֹבָתוֹ; וְהוּא שֶׁיִּשְׁמַע מִפִּי שֶׁהוּא חַיָּב בִּקְרִיאָתָהּ. לְפִיכָךְ אִם הָיָה הַקּוֹרֵא חֵרֵשׁ אוֹ קָטָן אוֹ שׁוֹטֶה, הַשּׁוֹמֵעַ מִמֶּנּוּ לֹא יָצָא; וְיֵשׁ אוֹמְרִים שֶׁהַנָּשִׁים אֵינָם מוֹצִיאוֹת אֶת הָאֲנָשִׁים. הַגָּה: וְיֵשׁ אוֹמְרִים אִם הָאִשָּׁה קוֹרְאָהּ לְעַצְמָהּ מְבָרֶכֶת: לִשְׁמֹעַ מְגִלָּה, שֶׁאֵינָהּ חַיֶּבֶת בִּקְרִיאָה (מָרְדְּכַי פ"ק דִּמְגִלָּה).
2 Whether one reads or hears from someone who reads - he has fulfilled his obligation. That is, if he hears from someone who is obligated in reading it. Therefore, if the reader was a deaf-mute, or a minor, or mentally infirm, one who hears from him does not fulfill [his obligation]. And there are those who say that women do not fulfill the obligation for men. Rema: And there are some who say, if a woman reads for herself, she blesses "to hear the megillah," because she is not obligated in reading (Mordechai first chapter of megillah)
ג אַנְדְּרוֹגִינוּס מוֹצִיא מִינוֹ וְלֹא שֶׁאֵינוֹ מִינוֹ, טֻמְטוּם וּמִי שֶׁחֶצְיוֹ עֶבֶד אֲפִלּוּ מִינוֹ אֵינוֹ מוֹצִיא. הַגָּה: יֵשׁ אוֹמְרִים דְּאֲפִלּוּ אֶת עַצְמוֹ אֵינוֹ מוֹצִיא וְצָרִיךְ לִשְׁמֹעַ מֵאֲחֵרִים (בֵּית יוֹסֵף).
3 An androgynous person fulfills the obligation for his kind, and not for those not of his kind. A Tumtum and someone who is half slave, may not fulfill the obligation even for his own kind. Rema: There are some who say that he cannot even fulfill his own obligation, and he must hear from others. (Beis Yosef)
ד הַשּׁוֹמֵעַ מְגִלָּה מִמִּי שֶׁהוּא מֻדָּר הֲנָאָה מִמֶּנּוּ, יָצָא.
4 One who hears the megillah from someone from whom he is sworn not to accept benefit, has fulfilled [his obligation].
ה מָקוֹם שֶׁאֵין מִנְיָן, אִם אֶחָד יוֹדֵעַ וְהָאֲחֵרִים אֵינָם יוֹדְעִים אֶחָד פּוֹטֵר אֶת כֻּלָּם; וְאִם כֻּלָּם יוֹדְעִים, כָּל אֶחָד קוֹרֵא לְעַצְמוֹ.
5 In a place with no minyan, if one [person] knows it and the rest do not, one can fulfill [the obligation] for them all. If they all know, everyone reads to himself.
ו מִנְהָג טוֹב לְהָבִיא קְטַנִּים וּקְטַנּוֹת לִשְׁמֹעַ מִקְרָא מְגִלָּה.
6 It is a good tradition to bring male children and female children to hear the reading of the megillah.