These are synastry overlay interpretations for Mercury in the partner’s 1st, 2nd, 3rd, 4th, 5th, and 6th houses. (See instead Mercury overlays in 7th–12th houses.)
Mercury in 1st House Synastry Overlay
If your Mercury is in your partner’s first house of a synastry overlay, you can easily express yourself to them.
Your partner will find it easy to understand you. They understand both the things you say, and also your unspoken intentions.
Mercury in 2nd House Synastry Overlay
Mercury is a bit restricted in the second house.
If your Mercury is in your partner’s second house of a synastry overlay, you find it difficult to see eye-to-eye with your partner. Coming up with the right words to say can be a challenge. You may get the impression that they don’t really get you.
Your partner may get the impression that the two of you lack common views.
Mercury in 3rd House Synastry Overlay
Since Mercury is at home in the third house, this is a stimulating overlay.
If your Mercury is in your partner’s third house of a synastry overlay, you are a real chatterbox around them. You enjoy long conversations over coffee with them since you find it easy to “let it all out” around them. The house person gets your gears turning.
Your partner will usually enjoy your conversations just as much, unless the partner is a very shy or introverted type.
Mercury in 4th House Synastry Overlay
If your Mercury is in your partner’s fourth house of a synastry overlay, the way you express yourself on a daily basis is compatible with your partner. You fit like a glove into your partner’s daily life.
Your partner is comfortable with you, with your mind, with your attitudes, and with the way you go about your daily life. Your partner doesn’t mind fitting you into his schedule.
Mercury in 5th House Synastry Overlay
If your Mercury is in your partner’s fifth house of a synastry overlay, you’re like sunshine to your partner. Your tone is delightful, good-natured, encouraging, and pleasing.
Your partner is enlivened by your upbeat style and looks forward to communicating with you. You make their day.
For both of you, your back-and-forth is lighthearted, cheerful, and even humorous. You gladly encourage each other. It’s easy to talk to each other. You will not suffer from boredom in this relationship.
Mercury in 6th House Synastry Overlay
If your Mercury is in your partner’s sixth house of a synastry overlay, your mind is very stable around your partner. You communicate with them in practical ways, and you’re usually focused on something specific. This is a more restrained type of communication, rather than lighthearted.
Your partner gets the impression that you’re a reliable person. They see you as a steady companion.
This isn’t exactly romantic or exciting, but for those who are looking for stability, this is just what the doctor ordered.