Strong's #1722: en (pronounced en)
 a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between 1519 and 1537); "in," at, (up-)on, by, etc.:--about, after, against, + almost, X altogether, among, X as, at, before, between, (here-)by (+ all means), for (... sake of), + give self wholly to, (here-)in(-to, -wardly), X mightily, (because) of, (up-)on, (open-)ly, X outwardly, one, X quickly, X shortly, (speedi-)ly, X that, X there(-in, -on), through(-out), (un-)to(-ward), under, when, where(-with), while, with(-in). Often used in compounds, with substantially the same import; rarely with verbs of motion, and then not to indicate direction, except (elliptically) by a separate (and different) preposition.
Thayer's Greek Lexicon:
 ̓ 
 
  en 
 
 1) in, by, with etc.
 
  Part of Speech: preposition
Relation: a primary preposition denoting (fixed) position (in place, time or state), and (by implication) instrumentality (medially or constructively), i.e. a relation of rest (intermediate between G1519 and G1537)
  Citing in TDNT: 2:537, 233
 
Usage:
This word is used 2731 times:
Mark 6:11: "more tolerable for Sodom and Gomorrah  in the day of judgment, than"
Mark 6:14: "and therefore mighty works do show forth  themselves in him."
Mark 6:17: "and bound him  in prison for Herodias' sake, his"
Mark 6:27: "went and beheaded him  in the prison,"
Mark 6:29: "and laid it  in a tomb."
Mark 6:47: "the ship was  in the midst of the sea, and"
Mark 6:51: "and they were sore amazed  in themselves beyond measure, and"
Mark 6:56: "country, they laid the sick  in the streets, and"
Mark 8:1: " In those days the multitude being very great, and having"
Mark 8:3: "to their own houses, they will faint  by the way: for"
Mark 8:14: "bread, neither had  they in the ship with them"
Mark 8:26: "town, nor tell it to any  in the town."
Mark 8:27: "of Caesarea Philippi: and  by the way he asked his"
Mark 8:38: "of me and of my words  in this adulterous and"
Mark 8:38: "of man be ashamed, when he cometh  in the glory of his"
Mark 9:1: "the kingdom of God come  with power."
Mark 9:29: "kind can come forth  by nothing, but by prayer"
Mark 9:29: "by nothing, but  by prayer and fasting."
Mark 9:33: "Capernaum: and being  in the house he asked them,"
Mark 9:33: "was it that ye disputed among yourselves  by the way?"
Mark 9:34: "they held their peace: for  by the way they had disputed among"
Mark 9:36: "a child, and set him  in the midst of them: and"
Mark 9:38: "one casting out devils  in thy name, and he followeth"
Mark 9:41: "For whosoever shall give you a cup of water to drink  in"
Mark 9:50: "the salt have lost his saltness,  wherewith will ye season it?"
Mark 9:50: "wherewith will ye season it? Have salt  in yourselves, and"
Mark 9:50: "salt in yourselves, and have peace  one with another."
Mark 10:10: "And  in the house his disciples asked him"
Mark 10:21: "and thou shalt have treasure  in heaven: and come, take up"
Mark 10:30: "But he shall receive a hundredfold now  in this time, houses,"
Mark 10:30: "lands, with persecutions; and  in the world to come"
Mark 10:32: "And they were  in the way going up to Jerusalem;"
Mark 10:37: "on thy left hand,  in thy glory."
Mark 10:43: "so shall it not be  among you: but whosoever"
Mark 10:43: "whosoever will be great  among you, shall be your"
Mark 10:52: "he received his sight, and followed Jesus  in the way."
Mark 11:9: "Hosanna; Blessed is he that cometh  in the name of the Lord:"
Mark 11:10: "father David, that cometh  in the name of the Lord: Hosanna in"
Mark 11:10: "the name of the Lord: Hosanna  in the highest."
Mark 11:13: "haply he might find anything  thereon: and when he came to"
Mark 11:15: "them that sold and bought  in the temple, and overthrew"
Mark 11:23: "sea; and shall not doubt  in his heart, but"
Mark 11:25: "Father also which  is in heaven may forgive you your"
Mark 11:26: "will your Father which  is in heaven forgive your trespasses."
Mark 11:27: "and as he was walking  in the temple, there come to"
Mark 11:28: "And say unto him,  By what authority doest thou these things?"
Mark 11:29: "me, and I will tell you  by what authority I do"
Mark 11:33: "Neither do I tell you  by what authority I do"
Mark 12:1: "he began to speak unto them  by parables. A certain man planted a vineyard,"
Mark 12:11: "the Lord's doing, and it is marvelous  in our eyes?"